Chapter 13: Inferential Statistics and Distributions 225
2-SampZTest
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
(m1:ƒm2)
•H
a
: m
1
<m
2
(m1:<m2)
•H
a
: m
1
>m
2
(m1:>m2)
In the example:
LISTA={154, 109, 137, 115, 140}
LISTB={108, 115, 126, 92, 146}
Data Stats
Input:
Calculated
results:
Drawn
results:
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