To perform a two-sample variance test
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1    Choose Stat > Basic Statistics > 2 Variances.

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

·    Both samples are in one column: Choose if the sample data are in a single column, and are differentiated by sample IDs in a second column.

Samples: Enter the column that contains the data for both samples.

Sample IDs: Enter the column that indicates which sample each observation belongs to.

·    Each sample is in its own column: Choose if the data for each sample is in a different column.

Sample 1: Enter the column that contains the data for the first sample.

Sample 2: Enter the column that contains the data for the second sample.

·    Sample standard deviations: Choose to enter summary values for the sample size and standard deviation of each sample. For summary data, only the F-test can be performed. The F-test is accurate only for normally distributed data.

Sample size: Enter the sample size for each sample.

Standard deviation: Enter the standard deviation for each sample.

·    Sample variances: Choose to enter summary values for the sample size and variance of each sample. For summary data, only the F-test can be performed. The F-test is accurate only for normally distributed data.

Sample size: Enter the sample size for each sample.

Variance: Enter the variance for each sample.

3    If you like, use any dialog box options.

4    Click OK.