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March 2, 2015

March 2, 2015

Posted by **lisa** on Sunday, May 12, 2013 at 10:25am.

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.

18. Numerous studies have found that males report higher self-esteem than females, especially for adolescents (Kling, Hyde, Showers, & Buswell, 1999). Typical results show a mean self-esteem score of M = 39.0 with SS = 60.2 for a sample of n =10 male adolescents and a mean of M =35.4 with SS= 69.4 for a sample of n =10 female adolescents.

a. Do the results indicate that self-esteem is significantly higher for males? Use a one-tailed test with = .01.

b. Use the data to make a 95% confidence interval estimate of the mean difference in self-esteem

between male and female adolescents.

c. Write a sentence demonstrating how the results from the hypothesis test and the confidence interval

would appear in a research report.

20. When people learn a new task, their performanceusually improves when they are tested the next day,

but only if they get at least 6 hours of sleep (Stickgold, Whidbee, Schirmer, Patel, & Hobson, 2000). The

following data demonstrate this phenomenon. The participants learned a visual discrimination task on one

day, and then were tested on the task the following day. Half of the participants were allowed to have at

least 6 hours of sleep and the other half were kept awake all night. Is there a significant difference

between the two conditions? Use a two-tailed test with =.05.

Performance Scores

6 Hours of Sleep No Sleep

n =14 n =14

M =72 M =65

SS =932 SS =706

22. Downs and Abwender (2002) evaluated soccer players and swimmers to determine whether the routine blows to the head experienced by soccer players produced long-term neurological deficits. In the study,

neurological tests were administered to mature soccer players and swimmers and the results indicated

significant differences. In a similar study, a researcher obtained the following data.

Swimmers Soccer players

10 7

8 4

7 9

9 3

13 7

7

6

12

a. Are the neurological test scores significantly lower for the soccer players than for the swimmers in the

control group? Use a one-tailed test with= .05.

b. Compute the value of r2 (percentage of variance accounted for) for these data.

- Statistics -
**PsyDAG**, Sunday, May 12, 2013 at 1:04pmIndicate your

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Also, we do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.

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