Question 9 0/pt 9 5 99 0 Details You wish to test the following claim (Ha) at a significance level of a = 0.10. For the context of this problem, Hd = 12 - M1 where the first data set represents a pre-test and the second data set represents a post-test. Ho: Hd = 0 Ha : Md # 0 You believe the population of difference scores is normally distributed, but you do not know the standard deviation. You obtain pre-test and post-test samples for n = 84 subjects. The average difference (post - pre) is d = - 4.4 with a standard deviation of the differences of sa = 31.3. What is the critical value for this test? (Report answer accurate to three decimal places.) critical value = What is the test statistic for this sample? (Report answer accurate to three decimal places.) test statistic =