Question

Functional foods are those containing nutritional
supplements in addition to natural nutrients. Examples
include orange juice with calcium and eggs with
omega-3. Kolodinsky, et al. (2008) examined attitudes
toward functional foods for college students. For
American students, the results indicated that females
had a more positive attitude toward functional foods
and were more likely to purchase them compared to
males. In a similar study, a researcher asked students
to rate their general attitude toward functional foods
on a 7-point scale (higher score is more positive). The
results are as follows:
Females Male
n  8 n  12
M  4.69 M  4.43
SS  1.60 SS  2.72
a. Do the data indicate a significant difference in
attitude for males and females? Use a two-tailed
test with   .05.
b. Compute r2, the amount of variance accounted for
by the gender difference, to measure effect size.
c. Write a sentence demonstrating how the results of
the hypothesis test and the measure of effect size
would appear in a research report.