In a random sample of four mobiledevices, the mean repair cost was $60.00 and the standard deviation was $11.00. Assume the population is normally distributed and use at-distribution to find the margin of error and construct a 90% confidence interval for the population mean. Interpret the results.

The 90% confidence interval for the population mean is (

nothing

,

nothing

).

(Round to two decimal places asneeded.)

The margin of error is $

nothing

.

(Round to two decimal places asneeded.)

Interpret the results. Choose the correct answer below.

A.

If a large sample of mobile devices are taken approximately 90% of them will have repair costs between the bounds of the confidence interval.

B.

It can be said that 90% of mobile devices have a repair cost between the bounds of the confidence interval.

C.

With 90% confidence, it can be said that the repair cost is between the bounds of the confidence interval.

D.

With 90% confidence, it can be said that the population mean repair cost is between the bounds of the confidence interva