A group of researchers studies the effects of different kinds of questioning on the memory of eyewitnesses to a crime. One group of witnesses is asked multiple choice questions, while a different group is asked short-answer questions, about the same crime. The dependent variable is the number of items correctly recalled:

MULTIPLE CHOICE SHORT ANSWER

12 4

15 2

11 6

10 3

Perform an independent-samples ANOVA to answer the question: do the data indicate a significant difference between the two groups?

Given:

• SSBetween= 136.125, dfBetween= 1
• SSWithin= 22.75, dfWithin= 6
• F critical value (
• = .05) = 5.99