Question

You wish to test the following claim (H) at a significance level of a = 0.05. For the context of this problem, d= 22 - 21 where the first data set represents a pre-test and the second data set represents a post-test. H:Hd = 0 H:Hd < 0 – 11.9 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= 85 subjects. The average difference (post-pre) is d = with a standard deviation of the differences of sd = 42.2. 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 =

Answer 1

Critical value of the test is

Critical value ( from t table )

to = t0,05 = -1.663

Test Statistic

t=d/(Sa/n)


t = -11.9/(42.2/85)

t = -2.600