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Chapter 13: Inferential Statistics and Distributions 345
2-SampZTest
2-SampZTest2-SampZTest
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)
Calculated
results:
Drawn
results:
Data Stats