Hypothesis Examples: 30+ Research Hypotheses by Subject (Easy Guide)
A clear hypothesis turns a broad research idea into something you can actually test. Yet many students struggle to write one that is specific, measurable and linked to theory. This guide gives you hypothesis examples for every major discipline, explains the difference between null and alternative hypotheses, and walks you through a simple formula for writing your own.
Use it alongside our guides to research objectives examples and how to choose research questions so that your aims, questions and hypotheses fit together.
What Is a Hypothesis in Research?
A hypothesis is a testable prediction about the relationship between two or more variables. It states what you expect to find before you collect data, based on existing theory and evidence. In quantitative research, the hypothesis is tested statistically and is either supported or not supported by the results.
A strong hypothesis is:
- Specific — it names the variables and population;
- Testable — it can be measured with data;
- Grounded — it comes from theory or previous research;
- Falsifiable — the data could prove it wrong.
Hypothesis Examples: Null vs Alternative
Most quantitative studies pair a null hypothesis (H0), which predicts no effect or relationship, with an alternative hypothesis (H1), which predicts that an effect exists. Statistical tests assess whether there is enough evidence to reject the null hypothesis.
| Research question | Null hypothesis (H0) | Alternative hypothesis (H1) |
|---|---|---|
| Does sleep affect exam performance? | There is no relationship between hours of sleep and exam scores among UK undergraduates. | Students who sleep 7+ hours before an exam score higher than those who sleep fewer than 5 hours. |
| Does remote working affect productivity? | Remote working has no effect on self-reported productivity. | Employees who work remotely at least three days a week report higher productivity. |
| Does social media use affect self-esteem? | There is no relationship between daily social media use and self-esteem. | Higher daily social media use is associated with lower self-esteem among 18–24-year-olds. |
Types of Hypotheses: Hypothesis Examples for Each Type
1. Simple Hypothesis
Predicts a relationship between one independent and one dependent variable.
Example: Drinking coffee before a lecture increases students’ attention scores.
2. Complex Hypothesis
Involves two or more independent or dependent variables.
Example: Income level and education level both predict household recycling rates.
3. Directional Hypothesis
States the expected direction of the relationship (higher, lower, more, less).
Example: Patients who receive nurse-led discharge education will have fewer 30-day readmissions than those who receive standard care.
4. Non-Directional Hypothesis
Predicts a relationship or difference but not its direction.
Example: There is a difference in job satisfaction between NHS nurses on day shifts and night shifts.
5. Associative vs Causal Hypothesis
An associative hypothesis predicts that variables change together; a causal hypothesis predicts that one variable causes change in another.
Associative: Time spent on revision apps is positively associated with GCSE maths grades.
Causal: Introducing a four-day working week reduces employee burnout.
6. Statistical Hypothesis
Expressed in terms of population parameters, usually for formal testing.
Example: H0: μ1 = μ2 (the mean exam score of group A equals that of group B).
Hypothesis Examples by Subject
The hypothesis examples below are grouped by discipline so you can adapt one to your own dissertation.
Business and Management
- Transformational leadership is positively associated with employee engagement in UK retail firms.
- Companies that publish ESG reports have higher customer trust scores than those that do not.
- Flexible working policies reduce staff turnover intention in small and medium-sized enterprises.
Marketing
- Influencer endorsements increase purchase intention for sustainable fashion among Gen Z consumers.
- Perceived ease of use positively affects intention to use mobile banking apps (Technology Acceptance Model).
- Personalised email subject lines produce higher open rates than generic subject lines.
Nursing and Healthcare
- Hourly rounding reduces patient falls on acute medical wards.
- Text-message reminders improve medication adherence among adults with hypertension.
- Nurses with higher resilience scores report lower levels of burnout.
Psychology
- Mindfulness training reduces exam anxiety in first-year university students.
- Participants exposed to upward social comparison report lower body satisfaction.
- Sleep deprivation impairs working-memory performance.
Education
- Students taught with flipped-classroom methods achieve higher test scores than those taught with traditional lectures.
- Regular formative feedback improves essay grades in undergraduate modules.
- Parental involvement is positively associated with primary pupils’ reading attainment.
Computing and Technology
- Two-factor authentication reduces successful phishing account takeovers in small businesses.
- Page load time is negatively associated with e-commerce conversion rates.
How to Write a Hypothesis in 5 Steps
- Start with a research question. For example: “Does flexible working reduce staff turnover?”
- Review the literature. Find out what theory and previous studies predict. Our guide on how to find a research gap helps here.
- Identify your variables. Independent variable (flexible working), dependent variable (turnover intention), and population (SME employees in the UK).
- Write the prediction. Use a simple formula: “[Independent variable] will [increase/decrease/affect] [dependent variable] among [population].”
- Write the null version and check testability. Make sure each variable can be measured with your chosen method.
Hypothesis vs Research Question vs Objective
| Element | Purpose | Example |
|---|---|---|
| Research aim | Overall purpose of the study | To examine the impact of flexible working on staff retention |
| Objective | Specific step towards the aim | To measure turnover intention among SME employees |
| Research question | What you want to find out | Does flexible working reduce turnover intention? |
| Hypothesis | What you predict you will find | Flexible working reduces turnover intention among SME employees |
See our dissertation aims and objectives guide for more on aligning these elements.
Do Qualitative Studies Need Hypotheses?
Usually not. Qualitative research explores meanings and experiences rather than testing predictions, so it relies on research questions instead. Some mixed-methods studies use hypotheses for the quantitative strand and open questions for the qualitative strand. Hypotheses are also often shown in a conceptual framework diagram as labelled arrows (H1, H2, H3).
Common Mistakes to Avoid (and Better Hypothesis Examples)
- Too vague: “Social media affects students” does not name a measurable outcome.
- Not testable: moral or value statements (“Tuition fees are unfair”) cannot be tested.
- Too many variables: keep each hypothesis focused on one relationship.
- Disconnected from theory: every hypothesis should be justified by your literature review. Our guide to conceptual framework vs theoretical framework explains how theory supports hypotheses.
- Confusing “prove” with “support”: data can support or fail to support a hypothesis, but rarely proves it.
Need Help Writing Your Hypotheses?
Our UK academics help students design research questions, hypotheses and frameworks that supervisors approve. Explore our dissertation proposal writing service, dissertation writing services UK, masters dissertation help or PhD dissertation writing service.
Frequently Asked Questions
What is a good example of a hypothesis?
“Students who sleep at least seven hours before an exam score higher than students who sleep fewer than five hours.” It is specific, measurable and testable.
How many hypotheses should a dissertation have?
Most undergraduate and master’s dissertations have two to five hypotheses, each linked to a research question.
What is the difference between H0 and H1?
H0 (null) predicts no effect or relationship; H1 (alternative) predicts that an effect or relationship exists.
Can a hypothesis be a question?
No. A hypothesis is a statement that predicts an outcome. The research question is the question; the hypothesis is the expected answer.
Conclusion
Bookmark these hypothesis examples and return to them when you draft your proposal.
Good hypothesis examples share the same features: clear variables, a defined population, a testable prediction and a link to theory. Use the formula and examples above to draft your own, check that each one can be measured, and make sure every hypothesis connects back to your research questions and objectives.
