Question

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.

1423 1222 989 695 726 837 724 745 545 622 1440 947

(a) Find the sample mean.

x overbarxequals=909.6

(Round to one decimal place as needed.)

(b) Find the sample standard deviation.

sequals=303.4

(Round to one decimal place as needed.)

(c) Construct a

99%

confidence interval for the population mean

muμ.

A

99 %

the confidence interval for the population mean is ___?

(Round to one decimal place as needed.)

Please tell me how you get the answer for step C. Thank You all in advance!

Answer 1