The state test scores for 12 randomly selected high school seniors are shown on the right....

The state test scores for

12 randomly selected high school seniors are shown on the right. Complete parts (a) through (c) below.

Assume the population is normally distributed.

1420

1220

982

695

720

837

724

750

542

627

1444

941

(a) Find the sample mean.

x overbar x =

(Round to one decimal place as needed.)

(b) Find the sample standard deviation.

s =

(Round to one decimal place as needed.)

A 90% confidence interval for the population mean is

(Round to one decimal place as needed.)

Solutions

Expert Solution

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