Learning Check, ANOVA

1. When an analysis of variance is conducted,

a. fewer subjects are needed than for a t test for independent means.
b. two estimates of the population variance are compared.
c. difference scores are computed, as in a t test for dependent means.
d. one-tailed tests are used for directional hypotheses.

2. When conducting an ANOVA, the null hypothesis is rejected when

a. the t score is significantly larger than the cutoff t.
b. the F ratio is significantly larger than 1.
c. the t score is significantly smaller than the F ratio.
d. the F ratio is significantly smaller than 1.

3. Analysis of variance should only be conducted when

a. sample sizes are greater than 30 per group.
b. there are less than 30 subjects per group.
c. population variances are equal.
d. population sizes are equal.

4. "MeanSquareWithin" (MSw) estimates population variance using

a. the sum of squares within each group.
b. the variance among means for each group.
c. the squared variance within groups.
d. the variation within each of the groups, averaged.