Psychology · Year 10 · Research Methods · 4.º Período

Formulating Hypotheses and Variables

Students will learn how to design psychological research by formulating testable hypotheses. They will identify independent, dependent, and extraneous variables in various scenarios.

TL;DR:Research methods are the 'how' of psychology. This topic focuses on the initial stages of an investigation: formulating a clear, testable hypothesis and identifying the variables involved. Students learn to distinguish between independent variables (what we change) and dependent variables (what we measure).

• National Curriculum Attainment Targets
• GCSE Psychology (AQA) 3.2.1.1: Formulation of testable hypotheses
• GCSE Psychology (AQA) 3.2.1.2: Types of variables

About This Topic

Research methods are the 'how' of psychology. This topic focuses on the initial stages of an investigation: formulating a clear, testable hypothesis and identifying the variables involved. Students learn to distinguish between independent variables (what we change) and dependent variables (what we measure).

They also explore the challenge of extraneous variables and the importance of operationalisation, which means defining variables in a way that can be measured precisely. This is a vital skill for the GCSE, as it allows students to design and critique scientific research. This topic comes alive when students can physically model the patterns of cause and effect in their own mini-experiments.

Key Questions

1. What makes a good psychological hypothesis?
2. How do we operationalise variables?
3. Why must extraneous variables be controlled?

Watch Out for These Misconceptions

Common Misconception

A hypothesis is just a 'guess' about what will happen.

What to Teach Instead

In psychology, a hypothesis must be a precise, testable statement that predicts the relationship between variables. Using a 'hypothesis checklist' in peer-review sessions helps students refine their definitions.

Common Misconception

The independent variable is the one we measure.

What to Teach Instead

The independent variable is the one the researcher manipulates or changes; the dependent variable is the one being measured. A simple 'IV = I change, DV = Data' mnemonic, reinforced through hands-on practice, helps clear this up.

Active Learning Ideas

Inquiry Circle

The Variable Hunt

Groups are given a series of 'bad' research questions (e.g., 'Does music help you study?'). They must work together to turn these into formal, operationalised hypotheses and identify the IV, DV, and potential extraneous variables.

35 min·Small Groups

Simulation Game

The Human Experiment

The teacher 'performs' a simple experiment, like testing reaction times with and without a distraction. Students must act as the researchers, identifying the variables and suggesting ways to control for things like noise or age.

25 min·Whole Class

Think-Pair-Share

Operationalisation Challenge

Students are given abstract terms like 'intelligence,' 'happiness,' or 'aggression.' They must work in pairs to come up with three different ways to operationalise (measure) each term for a psychological study.

20 min·Pairs

Frequently Asked Questions

What is an operationalised hypothesis?

An operationalised hypothesis is a testable statement where the variables are defined in a way that they can be clearly measured. For example, instead of saying 'exercise makes you happy,' you would say '30 minutes of running increases scores on a 1-10 happiness scale.'

What is an extraneous variable?

An extraneous variable is any variable other than the independent variable that might affect the results of an experiment. Researchers try to control these to ensure that any change in the dependent variable is truly caused by the independent variable.

What is the difference between a null and an alternative hypothesis?

An alternative hypothesis predicts that there will be a significant effect or relationship between variables. A null hypothesis predicts that there will be no significant effect and that any observed difference is due to chance.

What are the best hands-on strategies for teaching hypotheses and variables?

The best strategy is to have students design and run 'micro-experiments' in the classroom. By physically setting up the IV and measuring the DV, students see the logic of the experimental method in action, making the terminology much more intuitive.