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
(
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:
