STATS HW 10 M.C. Questions

| August 30, 2017

Question
HW 10 M.C. Questions

1. Which of the following accurately describes an independent-measures study?
a. It uses a different group of participants for each of the treatment conditions being compared.
b. It uses the same group of participants in all the treatment conditions being compared.

c. It uses one group of participants to evaluate a hypothesis about one population mean.

d. none of the other alternatives is correct

2 . The results of an independent-measures study produce a t statistic with df = 36. How many individuals participate in the study?
a. 37
b. 38
c. 73
d. 74

3. One sample has n = 5 scores and has SS = 36. A second sample of n =7 scores has SS = 64. What is the value of the pooled variance for these two samples?
a. 100/12
b. 100/10
c. 36/5 + 64/7
d. 36/4 + 64/6

4. An independent-measures research study uses two samples, each with n = 12, to compare two treatments. If the results are evaluated with a t statistic using a two-tailed test with ? = .05, then what are the boundaries for the critical region?

a. t = ±2.228
b. t = ±2.201
c. t = ±2.074
d. t =±2.069

5. Two samples, each with n=15 individuals, are used to evaluate the difference between two treatment conditions. If the researcher uses a two-tailed test with ?=.05, then the critical region for the statistic begins at ___________.
a. t = ±2.145
b. t = ±2.131
c. t = ±2.048
d. t =±2.045

6. Which of the following sets of sample data would produce the largest value for an independent-measures t statistic? Assume that n=10 for all samples.
a. a sample mean difference of 5 points with SS = 10 for both samples
b. a sample mean difference of 5 points with SS = 20 for both samples
c. a sample mean difference of 10 points with SS = 10 for both samples
d. a sample mean difference of 10 points with SS = 20 for both samples

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