User Guide

Chapter 13: Inferential Statistics and Distributions 220
• The third is a
> alternative hypothesis, such as p1>p2 for the 2-PropZTest.
To select an alternative hypothesis, move the cursor to the appropriate alternative, and then press
Í.
Selecting the Pooled Option
Pooled (2-SampTTest and 2-SampTInt only) specifies whether the variances are to be pooled for
the calculation.
•Select
No if you do not want the variances pooled. Population variances can be unequal.
•Select
Yes if you want the variances pooled. Population variances are assumed to be equal.
To select the
Pooled option, move the cursor to Yes, and then press Í.
Selecting Calculate or Draw for a Hypothesis Test
After you have entered all arguments in an inferential stat editor for a hypothesis test, you must
select whether you want to see the calculated results on the home screen (
Calculate) or on the
graph screen (
Draw).
•
Calculate calculates the test results and displays the outputs on the home screen.
•
Draw draws a graph of the test results and displays the test statistic and p-value with the
graph. The window variables are adjusted automatically to fit the graph.
To select
Calculate or Draw, move the cursor to either Calculate or Draw, and then press Í.
The instruction is immediately executed.
Selecting Calculate for a Confidence Interval
After you have entered all arguments in an inferential stat editor for a confidence interval, select
Calculate to display the results. The Draw option is not available.
When you press Í,
Calculate calculates the confidence interval results and displays the
outputs on the home screen.
Bypassing the Inferential Stat Editors
To paste a hypothesis test or confidence interval instruction to the home screen without displaying
the corresponding inferential stat editor, select the instruction you want from the
CATALOG menu.
Appendix A describes the input syntax for each hypothesis test and confidence interval instruction.
Note: You can paste a hypothesis test or confidence interval instruction to a command line in a
program. From within the program editor, select the instruction from either the
CATALOG
(Chapter
15) or the STAT TESTS menu.