(6.2)7

In a random sample of

ten

cell phones, the mean full retail price was

$545.50

and the standard deviation was

$180.00.

Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a

99%

confidence interval for the population mean

.

Interpret the results.

Question content area bottom

Part 1

Identify the margin of error.

enter your response here

square dollars

cell phones

dollars

(Round to one decimal place as needed.)