Use technology to construct the confidence intervals for the

Use technology to construct the confidence intervals for the population variance (sigma) ?

Solution

Confidence Interval Estimate for the Population Variance

Data

Sample Size

27

Sample Standard Deviation

4.9

Confidence Level

90%

Intermediate Calculations

Degrees of Freedom

26

Sum of Squares

624.26

Single Tail Area

0.05

Lower Chi-Square Value

15.3792

Upper Chi-Square Value

38.8851

Results

Interval Lower Limit for Variance

16.0539

Interval Upper Limit for Variance

40.5913

Interval Lower Limit for Standard Deviation

4.0067

Interval Upper Limit for Standard Deviation

6.3711