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Chapter 14: Hypothesis Tests – Small Samples
643
Table 14-3
: Data for
Example14-9
Use the
P
-value approach to test at the 5% significance level whether there
was a significant difference for the averages of the times for the two
medications.
Solution:
We will use the
Small Sample Test for the Difference betweenTwo
Independent Means
workbook to help with the computations. By using
this workbook, we will avoid all the computations. Also, we will enter these
values into the portion of the workbookwhere data are used to perform the
test. Since the standard deviations for the two populations of times are
unknown, we will have to use the results in that section.
Figure 14-19
shows the appropriate output from the workbook. Since we
are testing to determine whether there was a difference, then we will have to
use the results for a two-tailed test. Observe that the
P
-value is equal to
0.1805 for the two-tailed test so we can use the
P
-value approach to test the
hypothesis.