Paired-/Related Samples T-test
Use it to test whether there is a difference between the twoconditions(note: conditions must be RELATED-participants provide ineach condition).
You are interested in the relationship satisfaction of youngadults before and after they go off to college/university, whichseparates them from their sweetheart. You asked four couples torate the satisfaction of their relationship (on a scale of 0-50)before leaving for school and then again after a semester. Here arethe data:
Pair Before After
1 40 32
2 38 31
3 36 30
4 42 31
1. State the null and alternative hypotheses as well as yourcriterion:
2 .State your assumptions
3. Calculate difference scores, the sum of difference scores andthe sum of difference scores squared:
4. Calculate t
5. Figure out your degrees of freedom and use this to find thecritical t value
6. Reject or fail-to-reject the null hypothesis and state yourconclusions.
