Under the same context of Question 12, what is the test statistic of the hypothesis test at a = 0.05 ? O 0.668 O 0.747 O 0.812 O 0.894 None of the above is correctBlonde hair is believed to be thinner than brown hair. To check it hair thickness of two random samples of people was tested, n1 = 22 with brown hair and n2 = 20 with blonde hair (color and thickness are natural for all subjects). The mean hair thickness is X1 = 78um and X2 - 75 um respectively, 01 = 02 = 13 . The parameter of interest is the difference in means M1 - M2. What is the hypothesis test to conduct? O Ho : M1 - M2 = 0 H1 : MI - M2 0 O Ho : M1 - 12 = 0 H1 : M1 - M2 5 0 O Ho : MI - M2 = 0 H1 : M1 - M2 # 0 O None of the above is correct