
53Hypothesis Testing for Quality Control at a Manufacturing Company
are stacked in the “Size” column as shown in Figure4.21. Type in the shift
numbers in the “Shift” column as shown in Figure4.22. Then, select “Test
for Equal Variances” as shown in Figure4.23. This will open the dialog box
shown in Figure4.24. Select “Size” for “Response” and “Shift” for “Factors”.
Click on “OK” and the outputs shown in Figures4.25 and 4.26 are the results.
As shown in these two gures, the P-value (0.862) for Bartlett’s test is greater
than 0.05. Hence, the data from the three shifts have equal variances.
To perform Test 3, select “One-Way” as shown in Figu ...