Question

In: Statistics and Probability

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.)
​(c) Construct a 90​% confidence interval for the population mean μ.

A 90​% confidence interval for the population mean is ​
​(Round to one decimal place as​ needed.)

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orchestra answered 2 years ago
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