BEREMC10_0131536869.QXD
1/24/05
8:20 PM
Page 392
2. In the 2-Sample t dialog box (see Figure A10.6), select
the Samples in one column option button. In the
Samples: edit box, enter C1 or Sales. In the Subscripts:
edit box, enter C2 or Display. Select the Assume
equal variances check box for the pooled-variance t
test. Leave this edit box unchecked for the separatevariance t test. Click the Options button.
FIGURE A10.6 Minitab 2-Sample t Dialog Box
3. In the Alternative: drop-down list box, select not equal
for the two-tail test performed on page 355. (If performing a one-tail test, select less than or select greater
than.) Click the OK button.
4. Click the Graphs option button, and select the Boxplots
of data check box. Click the OK button to return to the
2-sample t dialog box. Click the OK button.
(To get the results in Figure 10.4 on page 349, first unstack
the data using Data Unstack Columns, then enter Sales
in the Unstack the data in: edit box and Display in the
Using Subscripts in: edit box. Select the After last column
in use option button.)
Using Minitab for the Paired t Test
A10.2 MINITAB
Using Minitab for the t Test for the
Difference Between Two Means
To illustrate the use of Minitab for the t test of the difference in two means, open the COLA.MTW worksheet.
Select Stat Basic Statistics 2-Sample t.
1. If the data are stacked with the values in one column
and the categories in a second column, as they are in
this worksheet, select the Samples in one column
option button. (If the samples are in different columns,
select the Samples in different columns option button and enter the column numbers or names.)
To illustrate the use of Minitab for the paired t test, open
Basic
the COMPTIME.MTW worksheet. Select Stat
Statistics Paired t.
1. In the Paired t dialog box (see Figure A10.7), in the
First sample: edit box, enter C1 or Current. In the
Second sample: edit box, enter C2 or New. Click the
Options button.
2. In the Alternative: drop-down list box, select greater
than for the one-tail test performed on page 363. Click
the OK button to return to the Paired t dialog box.
Click the Graphs button, and select the Boxplot of
differences check box. Click the OK button to return
to the Paired t dialog box. Click the OK button.
BEREMC10_0131536869.QXD
1/24/05
8:20 PM
Page 393
Appendix
393
test option button. In the Alternative: drop down list
box, select not equal for a two-tail test. Click the OK
button to return to 2-Proportions (Test and Confidence
Interval) dialog box. Click the OK button.
FIGURE A10.7 Minitab Paired t Dialog Box
Testing for the Difference Between Two
Proportions
To test the hypothesis for the difference in the proportion of
guests who would return between the Beachcomber and the
Windsurfer illustrated in Figure 10.16 on page 371, select
Stat Basic Statistics 2 Proportions.
1. In the 2 Proportions (Test and Confidence Interval)
dialog box (see Figure A10.8), select the Summarized
data option button.
2. In the First: row, enter 227 in the Trials: edit box and 163
in the Events: edit box. In the Second: row, enter 262 in
the Trials: edit box and 154 in the Events: edit box.
FIGURE A10.9 2 Proportions—Options Dialog Box
Using Minitab for the F Test for the
Difference Between Two Variances
To illustrate the use of Minitab for the F test of the difference in two variances, open the COLA.MTW worksheet.
Select Stat Basic Statistics 2 Variances.
1. In the 2 Variances dialog box (see Figure A10.10), select
the Samples in one column option button. In the
Samples: edit box, enter C1 or Sales. In the Subscripts:
edit box, enter C2 or Display. (If you have samples in different columns, select the Samples in different columns
option button and enter the names of the two columns in
the edit boxes. If you have summarized data instead of
the actual data, select the Summarized data option button and enter values for the sample size and variance.)
2. Click the OK button.
FIGURE A10.8 2 Proportions (Test and Confidence
Interval) Dialog Box
3. Click the Options button. In the 2 Proportions Options dialog box (see Figure A10.9) enter 95 in the
Confidence level: edit box. Enter 0.0 in the Test difference: edit box. Select the Use pooled estimate of p for
FIGURE A10.10 Minitab 2 Variances Dialog Box