Chapter 10, Problem 14P

In the Chapter Preview we presented a study showing that handling money reduces the perception pain (Thou, Vohs, & Baumeister, 2009). In the experiment, a group of college students was told that they were participating in a manual dexterity study. Half of the students were given a stack of money to count and the other half got a stack of blank pieces of paper. After the counting task, the participants were asked to dip their hands into bowls of very hot water (122°F) and rate how uncomfortable it was. The following data show ratings of pain similar to the results obtained in the study.

Counting Money	Counting Paper
7	9
8	11
10	13
6	10
8	11
5	9
7	15
12	14
5	10

a. Is there a significant difference in reported pain between the two conditions? Use a two-tailed test with $\alpha =.01$ .

b. Compute Cohen’s d to estimate the size of the treatment effect.