Question

m. If the 95% confidence interval limits for the population mean are 70 and 80, which of the following could be the 90% confidence interval limits? Please justify your answer. A. 72 and 78 B.65 and 75 c. 65 and 85 D.72 and 85

Answer 1

Ans:

Option A is correct.(72 and 78)

Explanation:

Lower the confidence level,narrower the width of the confidence interval.

width of 95% CI=80-70=10

So,width of 90% CI will be less than 10.

hence,option A is correct.