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Press the STAT key.
Press the ► key twice to highlight TESTS.
Press the number 5 key.
Type in .9 for p
0.
Type in 129 for x.
Type in 150 for n.
Move the cursor over <P
0
and press the ENTER key.
Move the cursor over Calculate and press the ENTER key.
The 1-PropZTest output shows the
alternative hypothesis: prop <.9
test statistic: Z=-1.632993162
p-value: P=.0512352053
sample proportion: ê=.86
sample size: n=150
The p-value is 0.051, which is more than 2.5%. We fail to reject H
0
and conclude that the
machine does not need adjustment.
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