In a random sample of five microwave? ovens, the mean repair cost was ?$75.00 and the standard deviation was ?$14. Assume the population is normally distributed and use a? t-distribution to construct a 90?% confidence interval for the population mean μ. What is the margin of error of μ??
The 90?% confidence interval for the population mean μ is ?
Choose the correct answer below.
A. It can be said that 90?% of microwaves have a repair cost between the bounds of the confidence interval.
B. With 90?% ?confidence, it can be said that the repair cost is between the bounds of the confidence interval.
C. If a large sample of microwaves are taken approximately 90?% of them will have repair costs 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 interval.