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- How to Write a Strong Hypothesis | Steps & Examples
How to Write a Strong Hypothesis | Steps & Examples
Published on May 6, 2022 by Shona McCombes . Revised on November 20, 2023.
A hypothesis is a statement that can be tested by scientific research. If you want to test a relationship between two or more variables, you need to write hypotheses before you start your experiment or data collection .
Example: Hypothesis
Daily apple consumption leads to fewer doctor’s visits.
Table of contents
What is a hypothesis, developing a hypothesis (with example), hypothesis examples, other interesting articles, frequently asked questions about writing hypotheses.
A hypothesis states your predictions about what your research will find. It is a tentative answer to your research question that has not yet been tested. For some research projects, you might have to write several hypotheses that address different aspects of your research question.
A hypothesis is not just a guess – it should be based on existing theories and knowledge. It also has to be testable, which means you can support or refute it through scientific research methods (such as experiments, observations and statistical analysis of data).
Variables in hypotheses
Hypotheses propose a relationship between two or more types of variables .
- An independent variable is something the researcher changes or controls.
- A dependent variable is something the researcher observes and measures.
If there are any control variables , extraneous variables , or confounding variables , be sure to jot those down as you go to minimize the chances that research bias will affect your results.
In this example, the independent variable is exposure to the sun – the assumed cause . The dependent variable is the level of happiness – the assumed effect .
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Step 1. Ask a question
Writing a hypothesis begins with a research question that you want to answer. The question should be focused, specific, and researchable within the constraints of your project.
Step 2. Do some preliminary research
Your initial answer to the question should be based on what is already known about the topic. Look for theories and previous studies to help you form educated assumptions about what your research will find.
At this stage, you might construct a conceptual framework to ensure that you’re embarking on a relevant topic . This can also help you identify which variables you will study and what you think the relationships are between them. Sometimes, you’ll have to operationalize more complex constructs.
Step 3. Formulate your hypothesis
Now you should have some idea of what you expect to find. Write your initial answer to the question in a clear, concise sentence.
4. Refine your hypothesis
You need to make sure your hypothesis is specific and testable. There are various ways of phrasing a hypothesis, but all the terms you use should have clear definitions, and the hypothesis should contain:
- The relevant variables
- The specific group being studied
- The predicted outcome of the experiment or analysis
5. Phrase your hypothesis in three ways
To identify the variables, you can write a simple prediction in if…then form. The first part of the sentence states the independent variable and the second part states the dependent variable.
In academic research, hypotheses are more commonly phrased in terms of correlations or effects, where you directly state the predicted relationship between variables.
If you are comparing two groups, the hypothesis can state what difference you expect to find between them.
6. Write a null hypothesis
If your research involves statistical hypothesis testing , you will also have to write a null hypothesis . The null hypothesis is the default position that there is no association between the variables. The null hypothesis is written as H 0 , while the alternative hypothesis is H 1 or H a .
- H 0 : The number of lectures attended by first-year students has no effect on their final exam scores.
- H 1 : The number of lectures attended by first-year students has a positive effect on their final exam scores.
Research question | Hypothesis | Null hypothesis |
---|---|---|
What are the health benefits of eating an apple a day? | Increasing apple consumption in over-60s will result in decreasing frequency of doctor’s visits. | Increasing apple consumption in over-60s will have no effect on frequency of doctor’s visits. |
Which airlines have the most delays? | Low-cost airlines are more likely to have delays than premium airlines. | Low-cost and premium airlines are equally likely to have delays. |
Can flexible work arrangements improve job satisfaction? | Employees who have flexible working hours will report greater job satisfaction than employees who work fixed hours. | There is no relationship between working hour flexibility and job satisfaction. |
How effective is high school sex education at reducing teen pregnancies? | Teenagers who received sex education lessons throughout high school will have lower rates of unplanned pregnancy teenagers who did not receive any sex education. | High school sex education has no effect on teen pregnancy rates. |
What effect does daily use of social media have on the attention span of under-16s? | There is a negative between time spent on social media and attention span in under-16s. | There is no relationship between social media use and attention span in under-16s. |
If you want to know more about the research process , methodology , research bias , or statistics , make sure to check out some of our other articles with explanations and examples.
- Sampling methods
- Simple random sampling
- Stratified sampling
- Cluster sampling
- Likert scales
- Reproducibility
Statistics
- Null hypothesis
- Statistical power
- Probability distribution
- Effect size
- Poisson distribution
Research bias
- Optimism bias
- Cognitive bias
- Implicit bias
- Hawthorne effect
- Anchoring bias
- Explicit bias
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A hypothesis is not just a guess — it should be based on existing theories and knowledge. It also has to be testable, which means you can support or refute it through scientific research methods (such as experiments, observations and statistical analysis of data).
Null and alternative hypotheses are used in statistical hypothesis testing . The null hypothesis of a test always predicts no effect or no relationship between variables, while the alternative hypothesis states your research prediction of an effect or relationship.
Hypothesis testing is a formal procedure for investigating our ideas about the world using statistics. It is used by scientists to test specific predictions, called hypotheses , by calculating how likely it is that a pattern or relationship between variables could have arisen by chance.
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McCombes, S. (2023, November 20). How to Write a Strong Hypothesis | Steps & Examples. Scribbr. Retrieved August 21, 2024, from https://www.scribbr.com/methodology/hypothesis/
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Shona McCombes
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- Knowledge Base
- Methodology
- How to Write a Strong Hypothesis | Guide & Examples
How to Write a Strong Hypothesis | Guide & Examples
Published on 6 May 2022 by Shona McCombes .
A hypothesis is a statement that can be tested by scientific research. If you want to test a relationship between two or more variables, you need to write hypotheses before you start your experiment or data collection.
Table of contents
What is a hypothesis, developing a hypothesis (with example), hypothesis examples, frequently asked questions about writing hypotheses.
A hypothesis states your predictions about what your research will find. It is a tentative answer to your research question that has not yet been tested. For some research projects, you might have to write several hypotheses that address different aspects of your research question.
A hypothesis is not just a guess – it should be based on existing theories and knowledge. It also has to be testable, which means you can support or refute it through scientific research methods (such as experiments, observations, and statistical analysis of data).
Variables in hypotheses
Hypotheses propose a relationship between two or more variables . An independent variable is something the researcher changes or controls. A dependent variable is something the researcher observes and measures.
In this example, the independent variable is exposure to the sun – the assumed cause . The dependent variable is the level of happiness – the assumed effect .
Prevent plagiarism, run a free check.
Step 1: ask a question.
Writing a hypothesis begins with a research question that you want to answer. The question should be focused, specific, and researchable within the constraints of your project.
Step 2: Do some preliminary research
Your initial answer to the question should be based on what is already known about the topic. Look for theories and previous studies to help you form educated assumptions about what your research will find.
At this stage, you might construct a conceptual framework to identify which variables you will study and what you think the relationships are between them. Sometimes, you’ll have to operationalise more complex constructs.
Step 3: Formulate your hypothesis
Now you should have some idea of what you expect to find. Write your initial answer to the question in a clear, concise sentence.
Step 4: Refine your hypothesis
You need to make sure your hypothesis is specific and testable. There are various ways of phrasing a hypothesis, but all the terms you use should have clear definitions, and the hypothesis should contain:
- The relevant variables
- The specific group being studied
- The predicted outcome of the experiment or analysis
Step 5: Phrase your hypothesis in three ways
To identify the variables, you can write a simple prediction in if … then form. The first part of the sentence states the independent variable and the second part states the dependent variable.
In academic research, hypotheses are more commonly phrased in terms of correlations or effects, where you directly state the predicted relationship between variables.
If you are comparing two groups, the hypothesis can state what difference you expect to find between them.
Step 6. Write a null hypothesis
If your research involves statistical hypothesis testing , you will also have to write a null hypothesis. The null hypothesis is the default position that there is no association between the variables. The null hypothesis is written as H 0 , while the alternative hypothesis is H 1 or H a .
Research question | Hypothesis | Null hypothesis |
---|---|---|
What are the health benefits of eating an apple a day? | Increasing apple consumption in over-60s will result in decreasing frequency of doctor’s visits. | Increasing apple consumption in over-60s will have no effect on frequency of doctor’s visits. |
Which airlines have the most delays? | Low-cost airlines are more likely to have delays than premium airlines. | Low-cost and premium airlines are equally likely to have delays. |
Can flexible work arrangements improve job satisfaction? | Employees who have flexible working hours will report greater job satisfaction than employees who work fixed hours. | There is no relationship between working hour flexibility and job satisfaction. |
How effective is secondary school sex education at reducing teen pregnancies? | Teenagers who received sex education lessons throughout secondary school will have lower rates of unplanned pregnancy than teenagers who did not receive any sex education. | Secondary school sex education has no effect on teen pregnancy rates. |
What effect does daily use of social media have on the attention span of under-16s? | There is a negative correlation between time spent on social media and attention span in under-16s. | There is no relationship between social media use and attention span in under-16s. |
Hypothesis testing is a formal procedure for investigating our ideas about the world using statistics. It is used by scientists to test specific predictions, called hypotheses , by calculating how likely it is that a pattern or relationship between variables could have arisen by chance.
A hypothesis is not just a guess. It should be based on existing theories and knowledge. It also has to be testable, which means you can support or refute it through scientific research methods (such as experiments, observations, and statistical analysis of data).
A research hypothesis is your proposed answer to your research question. The research hypothesis usually includes an explanation (‘ x affects y because …’).
A statistical hypothesis, on the other hand, is a mathematical statement about a population parameter. Statistical hypotheses always come in pairs: the null and alternative hypotheses. In a well-designed study , the statistical hypotheses correspond logically to the research hypothesis.
Cite this Scribbr article
If you want to cite this source, you can copy and paste the citation or click the ‘Cite this Scribbr article’ button to automatically add the citation to our free Reference Generator.
McCombes, S. (2022, May 06). How to Write a Strong Hypothesis | Guide & Examples. Scribbr. Retrieved 21 August 2024, from https://www.scribbr.co.uk/research-methods/hypothesis-writing/
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Shona McCombes
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Writing a Hypothesis Worksheet & Answers
Subject: Primary science
Age range: 11-14
Resource type: Worksheet/Activity
Last updated
29 October 2022
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*** Worksheet + Answers Set, made for teachers to just print & go!***
This worksheet focuses on writing hypotheses for scientific reports.
It can be used as a lesson supplement or set for homework for students to complete as the steps and examples of writing a hypothesis are included.
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*This activity was structured using teaching programs, ensuring its alignment to the Australian NSW NESA syllabus and learning outcomes. Such outcomes include SC4-8WS and SC4-9WS from the Stage 4 Science Syllabus.
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**Science Report Skills Worksheet Bundle + Answers Set!** Clear the confusion and misconceptions around writing scientific reports for students! The lessons include a teacher-guided component and an activity for students to practice their skills along with a sample answer set for teachers to print, teach and go! This bundle includes worksheets on writing- 1. Aim 2. Hypothesis 3. Materials & Risk Assessment 4. Variables 5. Method 6. Choosing the right graph 7. Assessing reliability, accuracy & validity 8. Bibliography For more awesome worksheets, check out the other items on my TES store! *This activity was structured using teaching programs, ensuring its alignment to the Australian NSW NESA syllabus and learning outcomes. Such outcomes include SC4-8WS and SC4-9WS from the Stage 4 Science Syllabus.
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A hypothesis is one part of what is called the scientific method. Good experiments or study is based on the scientific method. It helps give order and structures to experiment and ensure that interference from scientists or outside influences does not skew the results. It is important to understand the concepts of the scientific method before holding an experiment. The hypothesis starts by asking the correct questions. For example, if you have observed that the grass is greener when it rains the second time a week, you may ask what sort of grass it is? If the grass across the street responds to rain the same way? Or What elevation it is at? Any of these questions can become the backbone of the experiments you will perform.
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MIT study explains why laws are written in an incomprehensible style
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Legal documents are notoriously difficult to understand, even for lawyers. This raises the question: Why are these documents written in a style that makes them so impenetrable?
MIT cognitive scientists believe they have uncovered the answer to that question. Just as “magic spells” use special rhymes and archaic terms to signal their power, the convoluted language of legalese acts to convey a sense of authority, they conclude.
In a study appearing this week in the journal of the Proceedings of the National Academy of Sciences , the researchers found that even non-lawyers use this type of language when asked to write laws.
“People seem to understand that there’s an implicit rule that this is how laws should sound, and they write them that way,” says Edward Gibson, an MIT professor of brain and cognitive sciences and the senior author of the study.
Eric Martinez PhD ’24 is the lead author of the study. Francis Mollica, a lecturer at the University of Melbourne, is also an author of the paper .
Casting a legal spell
Gibson’s research group has been studying the unique characteristics of legalese since 2020, when Martinez came to MIT after earning a law degree from Harvard Law School. In a 2022 study , Gibson, Martinez, and Mollica analyzed legal contracts totaling about 3.5 million words, comparing them with other types of writing, including movie scripts, newspaper articles, and academic papers.
That analysis revealed that legal documents frequently have long definitions inserted in the middle of sentences — a feature known as “center-embedding.” Linguists have previously found that this kind of structure can make text much more difficult to understand.
“Legalese somehow has developed this tendency to put structures inside other structures, in a way which is not typical of human languages,” Gibson says.
In a follow-up study published in 2023, the researchers found that legalese also makes documents more difficult for lawyers to understand. Lawyers tended to prefer plain English versions of documents, and they rated those versions to be just as enforceable as traditional legal documents.
“Lawyers also find legalese to be unwieldy and complicated,” Gibson says. “Lawyers don’t like it, laypeople don’t like it, so the point of this current paper was to try and figure out why they write documents this way.”
The researchers had a couple of hypotheses for why legalese is so prevalent. One was the “copy and edit hypothesis,” which suggests that legal documents begin with a simple premise, and then additional information and definitions are inserted into already existing sentences, creating complex center-embedded clauses.
“We thought it was plausible that what happens is you start with an initial draft that’s simple, and then later you think of all these other conditions that you want to include. And the idea is that once you’ve started, it’s much easier to center-embed that into the existing provision,” says Martinez, who is now a fellow and instructor at the University of Chicago Law School.
However, the findings ended up pointing toward a different hypothesis, the so-called “magic spell hypothesis.” Just as magic spells are written with a distinctive style that sets them apart from everyday language, the convoluted style of legal language appears to signal a special kind of authority, the researchers say.
“In English culture, if you want to write something that’s a magic spell, people know that the way to do that is you put a lot of old-fashioned rhymes in there. We think maybe center-embedding is signaling legalese in the same way,” Gibson says.
In this study, the researchers asked about 200 non-lawyers (native speakers of English living in the United States, who were recruited through a crowdsourcing site called Prolific), to write two types of texts. In the first task, people were told to write laws prohibiting crimes such as drunk driving, burglary, arson, and drug trafficking. In the second task, they were asked to write stories about those crimes.
To test the copy and edit hypothesis, half of the participants were asked to add additional information after they wrote their initial law or story. The researchers found that all of the subjects wrote laws with center-embedded clauses, regardless of whether they wrote the law all at once or were told to write a draft and then add to it later. And, when they wrote stories related to those laws, they wrote in much plainer English, regardless of whether they had to add information later.
“When writing laws, they did a lot of center-embedding regardless of whether or not they had to edit it or write it from scratch. And in that narrative text, they did not use center-embedding in either case,” Martinez says.
In another set of experiments, about 80 participants were asked to write laws, as well as descriptions that would explain those laws to visitors from another country. In these experiments, participants again used center-embedding for their laws, but not for the descriptions of those laws.
The origins of legalese
Gibson’s lab is now investigating the origins of center-embedding in legal documents. Early American laws were based on British law, so the researchers plan to analyze British laws to see if they feature the same kind of grammatical construction. And going back much farther, they plan to analyze whether center-embedding is found in the Hammurabi Code, the earliest known set of laws, which dates to around 1750 BC.
“There may be just a stylistic way of writing from back then, and if it was seen as successful, people would use that style in other languages,” Gibson says. “I would guess that it’s an accidental property of how the laws were written the first time, but we don’t know that yet.”
The researchers hope that their work, which has identified specific aspects of legal language that make it more difficult to understand, will motivate lawmakers to try to make laws more comprehensible. Efforts to write legal documents in plainer language date to at least the 1970s, when President Richard Nixon declared that federal regulations should be written in “layman’s terms.” However, legal language has changed very little since that time.
“We have learned only very recently what it is that makes legal language so complicated, and therefore I am optimistic about being able to change it,” Gibson says.
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IV: DV: Hypothesis: Hypothesis and Variables Worksheet One. Name: KEY. Date: Hour: A hypothesis is a(n) educated guess or prediction. An independent variable is what is changed in an experiment. A dependent variable is what is measured in an experiment.
5. Phrase your hypothesis in three ways. To identify the variables, you can write a simple prediction in if…then form. The first part of the sentence states the independent variable and the second part states the dependent variable. If a first-year student starts attending more lectures, then their exam scores will improve.
Write a Question for each of the following hypothesis. Identify the manipulated (independent) variable and responding (dependent) variable for each hypothesis.
A hypothesis is a prediction about what. you will find about your big question. through research and/or an experiment. All Hypotheses need four things: You must state what you expect will happen. A hypothesis is an educated guess. It. It must be very easy to understand. needs to be based on existing theories.
3. Jacobie wanted to test the projectile motion of a pumpkin. His hypothesis was if the pumpkin had a larger mass, then the higher he could throw it, because the larger pumpkins would have more force. He bought three orange pumpkins and tested them all on the same day. His results are shown below:
Planning Phase > Step 4: Formulate a hypothesis Formulate a Hypothesis Worksheet Your Topic: _____ Research/Guiding Question: _____ _____ Purpose statement In one sentence state what the experiment will allow you to discover about your research/guiding question. This is your purpose statement, or the reason for the experiment. ...
Then, write a hypothesis or prediction. Independent Variable- One thing that the experimenter changes on purpose Dependent Variable- Something that changes as a result of the independent variable (often what is measured) Constant/Control Variable - Something kept the same on purpose. 1.
5 Logical hypothesis. A logical hypothesis suggests a relationship between variables without actual evidence. Claims are instead based on reasoning or deduction, but lack actual data. Examples: An alien raised on Venus would have trouble breathing in Earth's atmosphere. Dinosaurs with sharp, pointed teeth were probably carnivores. 6 Empirical ...
Step 5: Phrase your hypothesis in three ways. To identify the variables, you can write a simple prediction in if … then form. The first part of the sentence states the independent variable and the second part states the dependent variable. If a first-year student starts attending more lectures, then their exam scores will improve.
Worksheet 1: Hypothesis writing 1 For each of the following hypotheses, state whether it is: directional (one-tailed) null non-directional (two-tailed) a) Male participants will help an injured person more often than female participants.
"Questions" worksheet Write a testable question for each of the following ideas for experiments. 1. You want to figure out how many pine cones are on the average branch of a ... Hypothesis Writing Practice For each of the following questions, write a reasonable hypothesis using the correct format. 1. How will batting practice affect a ...
Writing a Hypothesis Worksheet & Answers. Subject: Primary science. Age range: 11-14. Resource type: Worksheet/Activity. File previews. zip, 205.36 KB. *** Worksheet + Answers Set, made for teachers to just print & go!***. This worksheet focuses on writing hypotheses for scientific reports. It can be used as a lesson supplement or set for ...
Task 4: write a hypothesis for each of these two scenarios, decide whether you need to write a directional or non-directional hypothesis first. Scenario 1: Dr Jemima Wickramasinghe is studying the effectiveness of a new anti-depressant, Seroboost against a placebo. She has tested the mood of participants by a
writing a hypothesis. Please help him. Hypothesis: If _____(manipulated variable) then _____ (responding variable), because_____. 3. Kasey lives in Moab, Utah. She likes to mountain bike for miles and miles until she can't bike anymore. She thinks that she can bike further when she drinks more than a ...
The series of worksheets you will find in this section will really test your understanding of the concept of the scientific method. You will be put to the test in many diverse scenarios. We start by learning the order of the steps of process and the history of how value was attributed to this process. We learn how to form and write valid ...
This resource is bundle of two resources: (1) Microsoft Word Student Handout of "Hypothesis Practice". This resource is designed to help students write a hypothesis in the correct "If" and "then" format. Students will read a brief description of an experiment and then will create an "If statement. 2. Products. $3.00 $3.50 Save $0.50. View Bundle.
Hypothesis Practice Hypothesis Writing Review The format for writing a hypothesis is… If (then describe what you will do in the experiment) then (predict the outcome of the experiment.) For each problem or question write a hypothesis, underline the independent variable once, and the dependent variable twice. 1. Chocolate may cause pimples. 2.
This sports-themed free scientific method worksheet gives your students practice with independent variables, dependent variables, and hypotheses. In the worksheet, students read scientific questions and identify variables by coloring stars. Then they write hypotheses. An answer key is included. ***This worksheet is a free sample from the All ...
This worksheet allows students to practice forming scientific hypothesis as a part of the scientific process. It includes background information, a definition of hypothesis, and seven scientific problems/purposes (guiding questions). Students will read each given problem, and write a hypothesis for the experiment. Updated as of May 2, 2014:
Question and Hypothesis Worksheet A student is interested in designing several experiments to test the factors that effect how quickly an Alka-Seltzer® tablet dissolves in water (solution rate). For each question, write an appropriate hypothesis that could be tested with an experiment. Be sure each hypothesis is in the proper "If…,
Provide at least 3. When writing a. hypothesis, it is helpful to use the following format - If, then, because. For example: If a student listens to classical music while studying then they will perform better in the exam because classical music helps the student focus on the information they are reading.
A hypothesis is one part of what is called the scientific method. Good experiments or study is based on the scientific method. It helps give order and structures to experiment and ensure that interference from scientists or outside influences does not skew the results. It is important to understand the concepts of the scientific method before ...
Name_____ Writing a Hypothesis Worksheet STEP 1 STATE YOUR TOPIC The topic I am researching is _____. Remember to: Be specific! Don't write a general topic like "weather." Narrow your focus: write "melting snow." STEP 2 WRITE A QUESTION • Keep it simple.
To test the copy and edit hypothesis, half of the participants were asked to add additional information after they wrote their initial law or story. The researchers found that all of the subjects wrote laws with center-embedded clauses, regardless of whether they wrote the law all at once or were told to write a draft and then add to it later.