Statistics help!! - Obtaining different results in SPSS for Independent Samples t Test and Paired Samples t Test

Posted on 2014-03-26 09:45:00 in Statistics by MORGAN ELYSE

I first performed an Independent Samples t Test in SPSS. Since my t-observed value was 1.485 and t-crit was 2.145, we failed to reject the null hypothesis and concluded that there was no difference between the two values.



I then used the same set of data and performed a Paired Samples (Correlated) t Test. I received a t-observed value of 3.208 and a t-crit value of 2.365. In this case, I rejected the null hypothesis and concluded that there was a statistically significant difference between the two values.



My question asks: Compare the results obtained in the first assignment with the results obtained in the second. If they are different, explain why the two investigators found different results.



In this case, the investigators found different results. I know that a Paired Samples t Test is controlled which makes it more powerful, but I don't really understand why my results are so different across the two statistical methods.



Any help is much appreciated!

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