Blatchley Chapter 11 Pretest

. In a study with 2 factors, for which one factor has 2 levels and the other has 3, which of the following is most appropriate and why?

A t-test because there are only two variables.

A three-way ANOVA because one of the factors has three levels.

A two-way ANOVA because there are two factors.

A two-way ANOVA because there are only two levels.

. In a 2x2 two-way ANOVA that has 35 participants, the df term for the interaction is...

4

1

3

31

. How are ANOVAs similar but different from t-tests?

They both allow for inferences to be made about mean differences. However, ANOVA is used only for data comparing three groups, and t-tests are only used for data comparing two groups.

ANOVAs are used to describe relationships between 2 or more variables. t-tests, on the other hand, are used to compare the means of up to two groups. ANOVAs do not compare mean differences.

ANOVAs are for comparing the means of 2 or more groups, whereas t-tests are used for comparing the means of up to two groups.

None of the above are correct.

. Which of the following about post-hoc analyses are not true?

They generally only done if the omnibus ANOVA is significant.

Post-hoc tests are generally not necessary for one-way ANOVAs, but are only for two-way ANOVAs.

Post-hoc tests are generally done after the ANOVA.

Post-hoc tests account more multiple comparisons and issues with false positives.

. In general, researchers and statisticians use ANOVAs to test which of the following?

Differences between means.

Differences between dependent variables.

Differences between means in only 3 or more groups.

Differences between medians between 2 or more groups.

Blatchley Chapter 11 Pretest

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