spss 配对t检验操作
The independent t-test is used to test for a difference betweentwo independent groups? (like males and females) on the means of acontinuous variable.
1) Select Statistics:Compare Means: Independent Samples T-Test (Figure 1). A menu likethat in Figure 2 should be displayed.
Figure 1:
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Figure 2:
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2) Select continuousvariables that you want to test from the list.
3) Click on the arrowthat will send them to the "Test Variable(s)" box.
2) Select the categoricalvariable from which you are going to extract the groups for comparisonand send it to the "Grouping Variable" box by pressing the appropriatearrow.
4) Click on the "DefineGroups" button. You are confronted with a small dialog box asking you fortwo groups. In this case, I'm using 1 and 2 (males and females).Click Continue when you're done. Then click OK when you're ready to getthe output.
Figure 3:
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5) These are descriptivestatistics concerning your variables.
6) This first partis important. You see, there is a possibility for two t-tests to occurhere. You have to know which one to use. When comparing groups like this,their variances must be relatively similar for the first t-test to be used.Levene's test checks for this. If the significance for Levene's test is0.05 or below, then the "Equal Variances Not Assumed" test (the one onthe bottom) is used. Otherwise you'll use the "Equal Variances Assumed"test (the one on the top). In this case the significance is 0.287, so we'llbe using the "Equal Variances" one.
7) Here's your t statistic.
8) These are the degreesof freedom (df).
9) Here's your significance(two-tailed).
