Chapter 13: Inferential Statistics and Distributions 223
Z-Test
Z-Test (one-sample z test; item 1) performs a hypothesis test for a single unknown population
mean m when the population standard deviation s is known. It tests the null hypothesis H
0
: m=m
0
against one of the alternatives below.
•H
a
: mƒm
0
(m:ƒm0)
•H
a
: m<m
0
(m:<m0)
•H
a
: m>m
0
(m:>m0)
In the example:
L1={299.4, 297.7, 301, 298.9, 300.2, 297}
Note: All STAT TESTS examples assume a fixed-decimal mode setting of 4 (Chapter 1). If you set
the decimal mode to
Float or a different fixed-decimal setting, your output may differ from the
output in the examples.
Data Stats
Input:
Calculated
results:
Drawn
results:
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