The correct answer for each question is indicated by a .

1

In a two-sample test of means for independent samples, the equal sign always appears in

A)

The null hypothesis.

B)

The alternate hypothesis.

C)

The upper tail of the test statistic.

D)

None of the above.

2

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)

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

3

Which of the following is a requirement for a two-sample 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 p and n(1 - p) are both greater than 5.

4

A random sample of 10 observations is selected from the first normal population and 8 from the second normal population. Assume that the unknown population variances are equal. For a one-tailed test of hypothesis (.01 significance level) to determine if there is a difference in the population means, the degrees of freedom are

A)

18

B)

17

C)

16

D)

None of the above.

5

A random sample of 10 observations is selected from the first normal population and 8 from the second normal population. Assume the unknown population variances are equal. For a one-tailed test of hypothesis (.01 significance level) to determine if there is a positive difference in the population means, the critical value(s) are

A)

2.552

B)

–2.921, 2.921

C)

–2.583, 2.583

D)

None of the above.

6

Which of the following is a requirement for the two-sample test of means for independent samples when both samples contain less than 30 observations?

A)

Normal populations.

B)

Equal population standard deviations.

C)

Equal sample sizes.

D)

All of the above are required.

7

To conduct a test of means for two independent samples, which of the following are always required?

A)

At least one of the samples must have 30 observations.

B)

Both samples must have 30 observations.

C)

np and n(1- p) must be 5.

D)

None of the above.

8

To conduct a test of hypothesis for dependent samples we assume that

A)

The distribution of the difference between the paired observations is normal.

B)

Both samples are at least 30.

C)

The samples are unrelated.

D)

All of the above.

9

When conducting a test of hypothesis for dependent samples

A)

We should have at least 30 pairs.

B)

The significance level is more than .05.

C)

The p-value is more than .10.

D)

None of the above.

10

Which of the following is not necessary to determine a p-value?

A)

Knowledge of whether the test is one-tailed or two-tailed.

B)

The value of the test statistic.

C)

The level of significance.

D)

All of the above are needed.

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