You wish to test the following claim (H1H1) at a significance level of ?=0.005?=0.005. For the context of this problem, d=x2?x1d=x2-x1 where the first data set represents a pre-test and the second data set represents a post-test. Ho:?d=0Ho:?d=0 H1:?d

You believe the population of difference scores is normally distributed, but you do not know the standard deviation. You obtain the following sample of data: pre-test