Texas Instruments -84 Plus, Manual Book

Page: 341 / 696

Chapter 13: Inferential Statistics and Distributions 338
When you enter values in any inferential stat editor, the TI-84 Plus stores them in
memory so that you can run many tests or intervals without having to reenter every
value.
Selecting an Alternative Hypothesis ( Selecting an Alternative Hypothesis ( Selecting an Alternative Hypothesis ( Selecting an Alternative Hypothesis (
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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 Selecting the Pooled Option Selecting the Pooled Option 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
.