In multiple comparison procedures, post-hoc tests are completed after the ANOVA. Why are post-hoc tests preferred over running several t-tests?
a. They decrease the probability of a Type I error.
b. They do not control familywise error rate.
c. It increases the probability of a Type I error.
d. They are more likely to be significant.
Question 2The book discusses an experiment by Merrell that examined the effects of Anthrax, Mozart, and no music on the amount of time it took a mouse to run a maze. To determine if there is an overall difference between the three groups, Merrell ran an ANOVA. To determine which means differed for each other, he ran a
a. regression.
b. repeated-measures t-test.
c. Bonferroni test.
d. chi-square.
Question 3A student wanted to determine if the mean number of times a student missed class was different for sophomores, juniors, and seniors. After collecting attendance data, the student ran an ANOVA and found that MSgroups was much larger than MSerror. This student can conclude that
a. sophomores miss class more than juniors and seniors.
b. there is a difference in the mean number of times sophomores, juniors, and seniors miss class.
c. seniors miss class more than sophomores and juniors.
d. there is no difference between the groups.
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