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# Sample Mean, Standard Deviation & Confidence Interval

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The State test scores for 12 randomly select High School Senior are shown below:
"Assume the population is normally distributed"
1425 1227 985
699 723 837
726 744 542
621 1445 949

a) Find the Sample Mean
_
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 (_______,_______)
Round to one decimal place as needed.

https://brainmass.com/statistics/confidence-interval/sample-mean-standard-deviation-confidence-interval-264179

#### Solution Preview

The State test scores for 12 randomly select High School Senior are shown below:
"Assume the population is normally distributed"
1425 1227 985
699 723 837
726 744 542
621 1445 949

a) Find the Sample Mean
...

#### Solution Summary

The sample mean, standard deviation and confidence intervals for state test scores in high school are examined.

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