# Hypothesis testing : Multiple choice questions

In chronological order, state the 5 steps of the standard procedure for hypothesis testing:

1.

2.

3.

4.

5.

Except as directed, check the single best answer.

6. Which of the following could be a valid null hypotheses?

A. μ ≥ 27.9 B. μ < 27.9

7. Which of the following can be rejected by a statistical test?

A. Null hypothesis B. Alternate hypothesis

8. If sample size is 20, which can be used to test a hypothesis about the mean?

A. Z B. t C. Either

9. If sample size is 30, which can be used to test a hypothesis about the mean?

A. Z B. t C. Either

10. The level of significance is the probability of:

A. Rejecting a true null hypothesis B. Accepting a false null hypothesis

11. The probability of Type I error is denoted by which Greek letter?

A. μ B. σ C. α D. β

12. Which kind of test is made for the null hypothesis "μ = 27.9"?

____ A. One-tailed test ____ B. Two-tailed test

13. In a two-tailed test, using Z as test statistic, if the significance level is 0.05, how much probability is in each of the two tails?

A. 1.0% B. 2.5% C. 5.0% D. 7.5%

We sample 100 light bulbs from a manufacturing plant to test the null hypothesis that the mean is 1,200 hours, using a significance level of 0.05. The sample average is 1,150 hours and the standard deviation is 500 hours.

14. What is the null hypothesis?

A. μ = 1,200 hrs B. μ ≠ 1,200 hrs C. μ < 1,200 hrs D. μ > 1,200 hrs

15. What is the alternate hypothesis?

A. μ = 1,200 hrs B. μ ≠ 1,200 hrs C. μ < 1,200 hrs D. μ > 1,200 hrs

16. What is the value of α?

A. 0.010 B. 0.025 C. 0.050 D. Unknown

17. Which statistic can properly be used in this hypothesis test?

A. Z B. t C. Either D. Neither

18. What are the approximate critical values of the test statistic? Indicate two values.

A. -3.0 B. -2.0 C. -1.0 D. +1.0 E. +2.0 F. +3.0

19. What is the value of the test statistic computed from the sample's descriptive statistics?

A. -3.0 B. -2.0 C. -1.0 D. +1.0 E. +2.0 F. +3.0

20. Is the null hypothesis rejected?

A. Yes B. No

#### Solution Summary

The solution gives the answers of multiple choice question from hypothesis testing .