1. The two sample t-test should be used when participants are tested multiple times.
a. True
b. False
2. If you are hypothesizing that post-test scores will be lower than pre-test scores, you should use a:
a. One tailed test
b. Two tailed test
c. T-test for independent means
d. Descriptive statistics
3. If you conduct a study of 32 pairs of individuals in which you use a matched pairs t-test, what are the degrees of freedom?
4. What assumptions are necessary to conduct a t-test? *Select all that apply.*
a. Homegeneity of variances
b. The outcome of interest is approximately normally distributed in the population from which the sample was obtained.
c. The sample must be randomly selected from the population or randomly assigned to experimental condition.
d. The sample size must be greater than 30.
5. When should the two sample t-test be used?
a. You are comparing more than two groups that are unrelated/independent.
b. You are comparing exactly two groups that are unrelated/independent.
c. You are comparing exactly two groups that are related/dependent.
d. You are comparing more than two groups that are related/dependent.
6. When should the matched pairs t-test be used?
a. You are comparing more than two groups that are unrelated/independent.
b. You are comparing exactly two groups that are unrelated/independent.
c. You are comparing exactly two groups that are related/dependent.
d. You are comparing more than two groups that are related/dependent.
7. The matched pairs t-test would be appropriate when participants are tested two or more times.
a. True
b. False
8. The sign of a t-statistic is important when conducting a two sample t-test.
a. True
b. False
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