The specifications in SPSS using, "Analyze", followed by selecting "Compare means" from the drop down menu and choosing "Independent samples t Test" will allow you to:

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The specifications described allow you to compare the mean difference in gain between two different groups, which is known as an independent samples t-test. It does not involve pretest or posttest scores of one group only nor does it involve comparing to a threshold group. Additionally, computing correlations is a different statistical analysis and not available in this particular drop-down menu in SPSS.

The Specifications in SPSS Using, "Analyze", Followed by Selecting "Compare