Non graded hw just want see to if I am doing them right! Use STATCRUNCH if possible

QUESTION 22 or (*) should we use?" To study the average length of phone call of the company's customer care, we take six calls as a sample. To construct a 90%-confidence interval for the parameter of interest, what critical value (z* -OAI* = 1.943 O B.Z* = 1.645 Oct. = 2.015 OD.Z* = 1.960 QUESTION 23 What could we do to get a narrower confidence interval? A Decrease the sample size n or increase the confidence level (1-a)*100% O B. Increase the sample size n or increase the confidence level (1-a)*100% C. Increase the sample size n or decrease the confidence level (1-a) *100% O D. Decrease the sample size n or decrease the confidence level (1-a)*100% QUESTION 24 Given a random sample, we compute a 68% CI for the population average as (90, 110). What might the sample average of this sample? A 110 O B. 95 O C. 105 D. 100 QUESTION 25