T-Test for Independent Samples by Groups

Select the Quick tab of the

dialog box to access options to quickly review the results of an independent t-test.

For more advanced results, use the options on the

Summary: T-tests

Click the Summary:T-tests button to compute the t-tests for independent samples and display the results in a spreadsheet.

The detail and formatting of the results depends on your selections in the

Options

tab.

Box & whisker plots

Click the Box & whisker plots button to produce a cascade of box and whisker plots for the dependent variables; one box plot for each variable will be produced.

Box and whisker plots summarize the distribution of the dependent variable for each group. Specifically, each group will be represented by one box and whisker component, which is made up of three parts:

A central circle to indicate the mean;
A box to indicate the mean plus/minus the standard error.
Whiskers around the box to indicate the mean plus/minus 1.96*standard error (this gives an approximate 95% confidence interval for the mean).

T-Test for Independent Samples by Groups - Quick Tab