25. Jackson and colleagues (2001) gave a questionnaire about Internet usage to university students. Table 12 shows their results comparing men and women.

(a) Select one significant and one nonsignificant result and explain these two results to a person who understands the t test for a single sample but does not know anything about the t test for independent means.

(b) ADVANCED TOPIC: Include a discussion of effect size and power (note that the sample sizes for the male and female groups are shown in the table footnote).