After one semester of classes, she computed the mean score on a standardized math test for the all female study group and for the hybrid study group and tested to see if there were any differences in performance. let μ1and μ2 be the mean cortisol level for each group respectively for the all female and hybrid groups. which of the following are the appropriate hypotheses in this case? h0: μ1−μ2= 0ha: μ1−μ2<  0h0: μ1−μ2<  0ha: μ1−μ2= 0h0: μ1−μ2≠0ha: μ1−μ2=0h0: μ1−μ2= 0ha: μ1−μ2≠ 0h0: μ1−μ2> 0ha: μ1−μ2=0h0: μ1−μ2= 0ha: μ1−μ2>  0