To do a 2-sample t-confidence interval and test
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1    Choose Stat > Basic Statistics > 2-Sample t.

2    Choose one of the following:

·    If your data are stacked in a single column:

-    Choose Both samples are in one column.

-    In Samples, enter the column containing the numeric data.

-    In Sample IDs, enter the column containing the group or population codes.

·    If your data are unstacked, that is each sample is in a separate column:

-    Choose Each sample is  in its own column.

-    In Sample 1, enter the column containing the first sample.

-    In Sample 2, enter the column containing the other sample.

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