When computing a paired samples t test, what are two ways it is different from an independent samples t test?
What will be an ideal response?
Ans: (1) The numerator consists of the mean of the difference scores (as opposed to the difference between the group means in an independent samples t test). (2) The denominator consists of the standard error of the difference scores (as opposed to the standard error of the difference between the means in an independent samples t test). (3) Degrees of freedom are sample size – 1 (as opposed to sample size – 2 in an independent samples t test). (4) The effect size is computed differently (for a paired samples t test it is the mean of the difference scores divided by the standard deviation of the difference scores).
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