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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
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.
1422
1225
983
700
727
838
723
742
540
630
1440
948
(a) Find the sample mean.
x=_______
(Round to one decimal place asneeded.)
(b) Find the sample standard deviation.
s=_______
(Round to one decimal place asneeded.)
(c) Construct a 95% confidence interval for the population mean .
A 95% confidence interval for the population mean is (_______,_______)
(Round to one decimal place asneeded.)
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