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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