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13-12 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 12 of 36
2
.
SampZTest (two-sample
z
test; item 3) tests the equality
of the means of two populations (
m
1
and
m
2
) based on
independent samples when both population standard
deviations (
s
1
and
s
2
) are known. The null hypothesis
H
0
:
m
1
=
m
2
is tested against one of the alternatives below.
•
H
a
:
m
1
ƒm
2
(
m
1:
ƒm
2
)
•
H
a
:
m
1
<
m
2
(
m
1:<
m
2
)
•
H
a
:
m
1
>
m
2
(
m
1:>
m
2
)
In the example:
LISTA={154 109 137 115 140}
LISTB={108 115 126 92 146}
Data Stats
Input:
,,
Calculated results:
,,
Drawn results:
2
.
SampZTest