Chapter 10 Quiz

2. The alternate hypothesis A. Is accepted if the null hypothesis is rejected. B. Will always contain the equal sign. C. Tells the value of the sample mean. D. None of the above.

The correct answer is a. That is it's whole job.

9. A Type II error occurs when A. We accept a false null hypothesis. B. We reject a true alternate hypothesis. C. We reject a false null hypothesis. D. None of the above.

The correct answer is a. That's its definition.

1. The null hypothesis A. Is a statement about the value of the population parameter. B. Will always contain the equal sign. C. Cannot include values less than 0. D. Both a and b are correct.

The correct answer is d. It could include values less than 0.

8. A p-value is A. The same as the population proportion. B. The same as the significance level. C. The fraction of the population that has a particular characteristic. D. The probability of finding a value of the test statistic this extreme when the null hypothesis is true.

The correct answer is d. That's its definition.

6. In a one-tailed test A. The rejection region is in only one of the tails. B. The rejection region is split between the tails. C. The p-value is always less than the significance level. D. The p-value is always more than the significance level.

The correct answer is a. That's what makes the test "one-tailed."

7. To conduct a one sample test of means and use the z distribution as the test statistic A. We need to know the population mean. B. We need to know the population standard deviation. C. We need n π to be less than 5. D. Both a and b are correct.

The correct answer is b. We are testing a proposed population mean but we need to know the population standard deviation.

5. The critical value is A. Calculated from sample information. B. Cannot be negative. C. The point that divides the acceptance region from the rejection region. D. A value determined from the test statistic.

The correct answer is c. It could be negative and is determined before you collect the sample and compute the test statistic.

4. A Type I error is A. The correct decision B. A value determined from the test statistic C. Rejecting the null hypothesis when it is true D. Accepting the null hypothesis when it is false.

The correct answer is c. That's its definition.

10. Which of the following statements are correct when deciding whether to use the z or the t distribution A. Use z in a test of proportions when n π and n(1-n) are greater than or equal to 5. B. Use z when we have a normal population and we know the standard deviation. C. Use t when the population is normal and the population standard deviation is not known D. All of the above statements are correct.

The correct answer is d. All of the above statements are true.

3. The level of significance A. Is frequently .05 or .01 B. Can be any value between 0 and 1. C. Is the likelihood of rejecting the null hypothesis when it is true. D. All of the above.

The correct answer is d. All these statements are correct.