A cognitive psychologist measures the recall scores (out of 50 words) of two groups of students studying under different noise conditions. The recall score data is interval level, but a histogram shows the data in one condition is highly skewed, and a statistical test indicates that the variances of the two groups are significantly different.
Which of the following describes the appropriate category of inferential test the psychologist should use, with the correct justification?
Parametric, because the data is measured at an interval level and there are two distinct groups of participants.
Non-parametric, because the data is skewed and violates the assumption of homogeneity of variance.
Parametric, because unequal variances are required to satisfy the assumption of population parameter estimation.
Non-parametric, because a recall score out of 50 represents ordinal data which fails the measurement level requirement.
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.