You wish to test the following daim jicance level fo his problem, ud = - Post second data set repres ndividual. Be careful you he differences are computed corred 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 post-test 24.2 29.7 63 35.1 3.6 O u W 1 08 W N U1 - D 0 - W 62.4 PMINNOW 24.7 12.3 64 2 56.6 LU 59.3 76.1 46.5 UT 3.8 64 .2 51.2