38 The confidence interval estimate of the population mean w

38. The confidence interval estimate of the population mean will be __________ for a 95% confidence level than for a 90% confidence level.

a. Narrower

b. Wider

d. indeterminate

39. A Type II error is committed when:

a) we reject a null hypothesis that is true

b) we don’t reject a null hypothesis that is true.

c) We reject a null hypothesis that is false.

d) We don’t reject a null hypothesis that is false.

40. If an economist wishes to determine whether there is evidence that average family income in a community exceeds $25,000

a) either a one-tailed or two-tailed test could be used with equivalent results.

b) A one-tailed test should be utilized.

c) A two-tailed test should be utilized.

d) None of the above.

41. A Type I error is committed when

a) We reject a null hypothesis that is true

b) We don’t reject a null hypothesis that is true.

c) We reject a null hypothesis that is false.

d) We don’t reject a null hypothesis that is false.

42. If a test of hypothesis has a Type I error of .01, we mean

a) If the null hypothesis is true, we don’t reject it 1% of the time.

b) If the null hypothesis is true, we reject it 1% of the time.

c) If the null hypothesis is false, we don’t reject if 1% of the time.

d) If the null hypothesis is false, we reject it 1% of the time.

Solution

38. Greater confidence levels produce WIDER confidence intervals.

THus, B. WIDER.

39.

Type II error is when we:

OPTION D: We don’t reject a null hypothesis that is false.

40.

It is asking it is \"exceeds\" 25000, which is just the right tail of 25000.

Thus, it is OPTION B: ONE TAILED TEST.

41.

Type I error is when:

OPTION A: We reject a null hypothesis that is true.

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