13-8 Inferential Statistics and Distributions
8313INFE.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:47 PM Printed: 02/19/01 1:38 PM
Page 8 of 36
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.
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.
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.
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.
Selecting the
Pooled Option
Selecting
Calculate or Draw
for a Hypothesis
Test
Selecting
Calculate for a
Confidence
Interval
Bypassing the
Inferential Stat
Editors