I'm 98% done with my statistics homework, and I'm just stuck on one issue. To make a long story short, I was asked to do a t-test with two groups of data, using a one-sample t-test on SPSS. So, basically, I was assessing change scores. For the next problem, I was asked to use the same data and assume that they were from two independent groups in an independent groups t-test. In the first analysis, the null hypothesis was rejected.. but in the second, it was retained.

The question I'm stuck on is, why do I think this difference occured? I think I have an idea... but I don't know if it's good enough. Can anyone enlighten me? Thanks so much!

Best,

Carrie