Question: Stephen Schmidt (1994) conducted a series of experiments examining the effects of humor

on memory. He collected a set of humorous sentences and then modified each one to

produce a nonhumorous version of the same sentence. The humorous sentences were

then presented to one group of participants and the nonhumorous sentences were

presented to another group. Each group was then given a test to determine how many

sentences they could recall. Data similar to those obtained by Schmidt are shown in the

following table.

______________________________

Number of Sentences Recalled

Humorous Nonhumorous

Sentences Sentences ____

4 5 2 4 5 2 4 2

6 7 6 6 2 3 1 5

2 5 4 3 3 2 3 3

3 3 5 3 4 1 5 3 _______

1. Do the data provide enough evidence to conclude that humor has a significant effect on memory? Use a two-tailed test at the .05 level of significance.
2. Calculate Cohen’s d to evaluate the size of the effect.
3. Calculate the percentage of variance explained by the treatment, r ², to measure effect size.

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