An experiment was done to compare the effect of having a conversation via a hands-free mobile phone, having a conversation with an in-car passenger, and no distraction (baseline) on driving accuracy. Twenty participants from two different age groups (18–25 years and 26–40 years) took part. All participants in both age groups took part in all three conditions of the experiment (in counterbalanced order), and their driving accuracy was measured by a layperson who remained unaware of the experimental hypothesis.
Which of the following sentences regarding the output below is correct?
A. Variances are heterogeneous for all levels of the repeated-measures variable.
B. Sphericity can be assumed in all conditions.
C. None of the means in each driving condition differ from each other.
D. Variances are homogeneous for all levels of the repeated-measures variable.
Answer: D
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