A. The null hypothesis.

B. The alternate hypothesis.

C. The upper tail of the test statistic.

D. None of the above.

In a two-sample test of means for independent samples, we use the z distribution when

A. The population standard deviations are equal.

B. Both populations are positively skewed.

C. Both samples are at least 30.

D. n and n(1-) are both greater than 5.

Which of the following is a requirement for a test of proportions.

A. The population standard deviations are equal.

B. Both populations are positively skewed.

C. Both samples are at least 30.

D. n and n(1-) are both greater than 5.

## This question was asked on May 17, 2010.

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