Hypothesis Testing & Cohen`s d

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Problem Set 1: Chapter 10: problems 2, 14, 22, 24; Chapter 11, problems 2, 4, 12, 20

Chapter 10

2. Describe what is measured by the estimated standard error in the bottom of the independent measures t test.
14. Do you view a chocolate bar as delicious or as fattening...?

Males Females
n = 6 n = 9
M = 31 M = 45
SS = 490 SS = 680
a. Based on these results, is there a significant difference between the attitudes for males and for females? Use a two-tailed test with ? = .05.
b. Compute r2, the percentage of variance accounted for by the gender differences to measure effect size for this study.
22. Steven Schmidt (1994)...Use a two-tailed test with ? = .05

Humorous Sentences Nonhumorous Sentences

4 5 2 4 6 3 5 3
6 7 6 6 3 4 2 6
2 5 4 3 4 3 4 4
3 3 5 3 5 2 6 4
Do the results indicate a significant difference in the recall of humorous versus non-humorous sentences? Use a two-tailed test with alpha = .05.
24. A researcher conducts an independent measures research study and obtains t = 2.070 with df = 28.
a. How many individuals participated in the entire study?
b. Using a two-tailed test with a = .05, is there a significant difference between the two treatment conditions.
c. Compute r2 to measure the percentage of variance accounted for by the treatment effect.
Chapter 11
2. Participants enter a research study with unique characteristics that produce different scores from one person to another. For an independent-measures study, these individual differences can cause problems. Briefly explain how these problems are eliminated or reduced with a repeated-measures study.
4. A researcher conducts an experiment comparing two treatment conditions and obtains data with 10 scores for each treatment condition.
a. If the researcher used an independent-measures design, how many subjects participated in the experiment?
b. If the researcher used a repeated-measures design, how many subjects participated in the experiment?
c. If the researcher used a match-subjects design, how many subjects participated in the experiment?
12. The stimulant Ritalin has been shown to increase attention span and improve academic performance in children with ADHD...n = 25, MD = 6.8, s = 5.5.
a. Is this result sufficient to conclude that Ritalin has a significant effect on attention span? Use a two-tailed test with ? = .01.
b. Compute r2 and an estimated Cohen`s d to measure the size of the effect.
20. A researcher uses a matched samples design to investigate whether single people who own pets are generally happier than singles without pets. Test with ? = .05, two-tailed.

Matched Pair Participants from US Pet Owner
A 10 15
B 9 9
C 11 10
D 11 19
E 5 17
F 9 15

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