A researcher sampled 16 couples and measured the mean difference in their marital satisfaction. Each couple was paired and the differences in their ratings (on a 7-point scale) were taken. If the mean difference in satisfaction ratings for this sample was 1.8 ± 2.0 (MD ± SD), then what is the decision at a .05 level of significance?
A. Satisfaction ratings do not significantly differ, t(14) = 0.90.
B. Satisfaction ratings do not significantly differ, t(15) = 0.90.
C. Satisfaction ratings significantly differ, t(14) = 3.60.
D. Satisfaction ratings significantly differ, t(15) = 3.60.
Ans: D
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