# Construct a 90% confidence interval for the population standard deviation

The grade point averages for 10 randomly selected students are listed in column 1 of the minitab worksheet. the distribution of GPAs is known to be approximately normally distributed.

If possible, construct a 90% confidence interval for the population standard deviation. Interpret the meaning of the interval.

GPAs

2.0

3.2

1.6

2.9

0.9

4.0

3.3

2.9

3.6

0.8

https://brainmass.com/statistics/confidence-interval/construct-confidence-interval-population-standard-deviation-150483

#### Solution Summary

The solution constructs a 90% confidence interval for the population standard deviation. The meaning of the interval is interpreted.

$2.19