Ttest
It tests whether a sample mean of a normally distributed interval variable significantly differs from a hypothesized value.
To run a paired ttest

Click on the analyze menu compare means– click on the PairedSample TTest
 The paired sample ttest dialog box opens
 Select the two variables you want to test from the left and then click the transfer arrow button to move them to the paired variables box
 Click ok
 The output viewer window opens
To run the independent ttest
Is used to compare the means of normally distributed dependent variables for two dependent variables.

Click on the analyze menu compare means– click on the IndependentSample TTest
 The independent sample ttest dialog box opens
 Select a variable on the left side and click on the arrow to transfer it to the Tests variable(s)
 Select another variable from the left side and move it to the Grouping variable box
 Click the Define Groups button to open the define groups dialog box.
 Type 0 on the Group 1 and type 1 on the Group 2 Click continue
 Click Ok
 The output viewer window opens with several tables including the independent sample ttest.
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