7. The choice between a z-test and a t-test for a population mean depends primar

Question

7. The choice between a z-test and a t-test for a population mean depends primarily on:

a. the sample size. b. the level of significance. c. whether a one- or two-tailed test is indicated. d. whether the given standard deviation is from the population or the sample. e. a z-test should never be used.

8. The p-value of a test of significance is the probability that:

a. the decision resulting from the test is correct. b. 95% of the confidence intervals will contain the parameter of interest. c. the null hypothesis is true. d. the alternative hypothesis is true. e. None of these describes the p-value.

9. If we want to claim that a population parameter is different from a specified value, this situation can be considered as a two-tailed test.

a. True b. False

10. To use the matched-pairs t procedure to perform a significance test on two samples, we assume

a. The populations’ standard deviations are known. b. The samples from each population are dependent. c. The distributions are exactly normal in each population. d. The sample sizes are large. e. None of the above.

Explanation / Answer

7.We use z test when n>30 and t test when n<30.

Hence answer is a. the sample size.

Related Questions

Navigate

• Browse (All)
• Browse 7
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.