Statistics Answer the follwoing questions based on a lab Mi

Statistics : Answer the follwoing questions based on a lab (Minitab) -part2-

Statistics : Answer the follwoing questions based on a lab (Minitab) -part2- Welcome to Mintab, press F1 for help. Results for: LAB 8 DATA.MTW Two-Sample T-Test and CI: Female Study Hrs, Male Study Hrs

Solution

A.
90% confidence interval is (0.7797, 0.9003)
I am 90% confident that the true population proportion is between 77.97% and 90.03%.

B.
95% confidence interval is (0.7681, 0.9119)
I am 95% confident that the true population proportion is between 76.81% and 91.19%.

C.
99% confidence interval is (0.7456, 0.9344)
I am 99% confident that the true population proportion is between 74.56% and 93.44%.  

D.
No, not at least 70%, but rather at least 78% but at most 90% listeners if you want to be at least 90% confident.