Gender Difference

Question

A researcher conducts an independent-measures study comparing two treatments and reports the t statistic as t(30) = 2.085.

a. How many individuals participated in the entire study?

b. Using a two-tailed test with α=.05, is there a significant difference between the two treatments?

c. Compute r2 to measure the percentage of variance accounted for by the treatment effect.

Question

Do you view a chocolate bar as delicious or as fattening? Your attitude may depend on your gender. In a study of American college students, Rozin, Bauer, and Catanese (2003) examined the importance of food as a source of pleasure versus concerns about food

associated with weight gain and health. The following results are similar to those obtained in the study. The scores are a measure of concern about the negative aspects of eating.

Males  Females

n = 9  n = 15

M = 33  M = 42

SS = 740 SS = 1240

a. Based on these results, is there a significant difference between the attitudes for males and for females? Use a two-tailed test with α=. .05.

b. Compute r2, the percentage of variance accounted for by the gender difference, to measure effect size for this study.

c. Write a sentence demonstrating how the result of the hypothesis test and the measure of effect size would appear in a research report.