Exam 10: Data Mining

Exhibit 10.2 The following questions are based on the problem description,spreadsheet,and the Analytic Solver Platform Discriminant Analysis report below. A college admissions officer wants to evaluate graduate school applicants based on their GMAT scores,verbal and quantitative.Students are classified as either successful Group 1),marginally successful Group 2)or not- successful Group 3)in their graduate studies.The officer has data on 20 current students,7 successful Group 1),6 marginally successful Group 2)and 7 not successful Group 3). Discriminant Analysis Report October 1,2013 4:22:38 PM Unpooled Estimates of within-group Covariance matrices are used,assuming they are different. Group Centroids Group Quantitative Verbal 1 697.7142857 650.4285714 2 647.8571429 630.7142857 3 5876666667 6051666667 $\text {Group}$ $\text {Frenuencies}$ Group Relative Frequency 1 35.00\% 2 35.00\% 3 30.00\% Training Sample Classification Mahalanobis Distances $\text {Classification}$ $\text {Matrix}$ Actual / Predicted Group1 Group2 Group3 Total \% correct Group1 6 1 0 7 85.71\% Group2 0 7 0 7 100.00\% Group3 0 0 6 6 100.00\% Total 6 8 6 2 95.00\% -Refer to Exhibit 10.2.What is the quantitative test score value of the group centroid for group 1?

If using the regression tool for two-group discriminant analysis,in the regression dialog box,the Input Y-Range entry corresponds to