Operation Manual

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
Í
.