Adults choose their preferred font size on a reading device before reading a passage. The psychologist records the chosen font size and the time taken to finish the passage, giving a pair of measurements for each participant. The pairs are then examined for a pattern.
Which change would make font size an independent variable in this investigation?
Create two font-size conditions and decide which one each participant receives.
Record each chosen font size more precisely before measuring the reading time.
Plot font size on the horizontal axis and reading time on the vertical axis.
Predict before testing that larger font sizes will produce shorter reading times.
182 exam-style questions on OCR GCSE Psychology 7.1 Planning Research, covering 7.1.1 Hypotheses, 7.1.2 Variables, 7.1.3 Experimental Designs, 7.1.4 Populations and Sampling, 7.1.5 Ethical issues, and 7.1.6 Dealing with ethical issues and BPS Code. Each one has a worked solution and a mark scheme showing where the marks go.