A researcher conducts an experiment to compare the reading speeds (in words per minute) of two groups of participants under different lighting conditions. They want to use a parametric statistical test to analyze their results.
Which of the following conditions would prevent the researcher from performing a parametric test?
The standard deviation of reading speeds in Group 1 is significantly different from the standard deviation in Group 2.
The study uses a matched-pairs design rather than an independent groups design.
The dependent variable (reading speed) is measured on a ratio scale.
The sample is drawn from a population where reading speeds are normally distributed.
644 exam-style questions on OCR A Level Psychology Research methods and techniques. Each one has a worked solution and a mark scheme showing where the marks go.