To calculate a test and confidence interval for 1 Variance
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1    Choose Stat > Basic Statistics > 1 Variance.

2   Choose one of the following from the drop-down list:

·    One or more  samples, each in a column: Choose if you entered raw data into columns and enter the column(s) that contain the data.

·    Sample standard deviation: Choose if you have summary values for a sample's size and standard deviation.

Sample size: Enter the sample size.

Sample standard deviation: Enter the sample's standard deviation.

·    Sample variance: Choose if you have summary values for a sample's size and variance.

Sample size: Enter the sample size.

Sample variance: Enter the sample's variance.

3    If you want to perform a hypothesis test for the population standard deviation or variance, check Perform hypothesis test, choose an option from the pull-down, and enter the hypothesized value:

Hypothesized standard deviation: Choose to test the standard deviation.

Hypothesized variance: Choose to test the variance.

Value: Enter the hypothesized value for the standard deviation or variance.

4    If you like, use any dialog box options, and click OK.