For each problem, select the best response.

(a) In contrast to a chi-square test, an ANOVA F test is most appropriate when the

A. data are quantitative.
B. standard deviations must be estimated.
C. samples sizes are equal.
D. standard deviations are not equal.
E. number of samples is two.

(b) The alternative hypothesis for an ANOVA F test is that

A. none of the population means are equal.
B. none of the population variances are equal.
C. all of the population means are not equal.
D. all of the population variances are not equal.
E. at least two of the population means are not equal.

(c) The null hypothesis for an ANOVA F test is that

A. sample means are equal.
B. population standard deviations are not equal.
C. population means are equal.
D. sample standard deviations are not equal.
E. sample sizes are equal.