t5 Sheet6 Sheet7 Sheet8 + B A Mann-Whitney [Test: Normal Approximation Assuming as the null hypothesis that the central locations of the two population distributions are the same, the Mann- Whitney U has the following mean and varia 12,112( 71, + n2 + 1) Var(U) = 12 Then, for large sample sizes (both at least 10), the distribution of the random is approximated by the normal distribution. Example v18 Hours of Study (Mann-Whitney U Test) shows the numbers of hours per week students claim to spend studying for introductory finance and accounting courses. The data are from independent random samples of 10 finance students and 12 accounting students. 1 Do the data indicate a difference in the median number of hours per week that students spend studying for introductory finance and accounting courses? The name of the data file is Hours. (14.24) (14.22) (14.23) of U