Zhou and Vohs (2009) published a study showing that handling money reduces the perception pain. 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.

a. Is there a significant difference in reported pain between the two conditions? Use a two-tailed test with a 5 .01.

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