Basic Statistics: Tales of Distributions 10th Edition

Published by Cengage Learning
ISBN 10: 0-49580-891-1
ISBN 13: 978-0-49580-891-6

Chapter 13 - Analysis of Variance: Factorial Design - Problems: 13.4

Answer

Here is a graph that displays an interaction:
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Work Step by Step

The green line is the mean time to finish the exam for the open-versus closed-book exam, and the mean time to finish is identical for each type of exam. But if you look at just the open book exam, you see that the non-A students take much longer than the A students to finish. But the situation is reversed when you look at the closed-book means. With the closed-book exam, the non-A students take less time that the A students. This reversal in the data results is indicative of an interaction.
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