THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A sales representative has 425 accounts.From a random sample of 60 of these accounts,she found that the average yearly order was $1,250 with a standard deviation of $70.She also found that 28 out of 60 in the sample have placed an order in the last four weeks.
-A simple random sample of 250 from a total 1,200 colleges in the United States contains 40 colleges that charge a technology fee in addition to the tuition fee.Find a 99% confidence interval for the proportion of all colleges charging a technology fee.
A)0)16 ± 0.087
B)0)16 ± 0.021
C)0)16 ± 0.115
D)0)16 ± 0.053

Question

Quizplus · Accepted Answer

The Answer of THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A sales representative has 425 accounts.From a random sample of 60 of these accounts,she found that the average yearly order was $1,250 with a standard deviation of $70.She also found that 28 out of 60 in the sample have placed an order in the last four weeks.
-A simple random sample of 250 from a total 1,200 colleges in the United States contains 40 colleges that charge a technology fee in addition to the tuition fee.Find a 99% confidence interval for the proportion of all colleges charging a technology fee.
A)0)16 ± 0.087
B)0)16 ± 0.021
C)0)16 ± 0.115
D)0)16 ± 0.053