Texas Instruments TI-83 PLUS - Manual (Page 394)

TI-83 Plus Inferential Statistics and Distributions 391
Selecting an Alternative Hypothesis ( ƒ < >)
Most of the inferential stat editors for the hypothesis tests prompt you to
select one of three alternative hypotheses.
•
The first is a ƒ alternative hypothesis, such as mƒm 0
for the Z . Test .
•
The second is a < alternative hypothesis, such as m 1< m 2 for the
2 . SampTTest .
•
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
Н .