User Guide

359
TTests
.134 .719 3.783 18 .001 26.10 6.90 11.61 40.59
3.783 17.163 .001 26.10 6.90 11.56 40.64
Equal
variances
assumed
Equal
variances
not
assumed
Blood
pressure
F Significance
Levene's Test for
Equality of Variances
t df
Significance
(2-tailed)
Mean
Difference
Std. Error
Difference
Lower Upper
95% Confidence Interval
of the Mean
t-test for Equality of Means
Independent Samples Test
To Obtain an Independent-Samples T Test
E From the menus choose:
Analyze
Compare Means
Independent-Samples T Test...
Figure 20-2
Independent-Samples T Test dialog box
E Select one or more quantitative test variables. A separate t test is computed for
each variable.
E Select a single grouping variable, and click Define Groups to specify two codes for
the groups that you want to compare.