# Sample Mean, Standard Deviation & Confidence Interval

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.