A paired samples t-test compares the means of two variables. By running it in SPSS --- predictive analytics software from IBM --- you can find whether the difference between the two means is statistically significant, which will allow you to gauge if the same group tested similarly or differently on two different subjects, how much their answers varied and the standard error. Additionally, you will be able to determine the confidence interval and its significance. The paired samples t-test can aid in showing how the same group responds in two different categories of testing.
- SPSS software
- Data for computing
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Instructions
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1
Open SPSS and the data you wish to analyze.
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Navigate to Analyze, then choose Compare Means from the drop-down menu.
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Choose "Paired-Samples T Test" from the menu. SPSS will then ask you to select the two variables you will compare.
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Choose the two variables you will compare by clicking on them, and press the right arrow button. Hit "OK." This will generate your paired samples t-test.
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Look to the box labeled "Paired-Samples Test." This box will contain the t and the significance, or p-value. For a t-test to be statistically significant, your p-value must be lower than .05.