POLS210

Lambda

 

St. Algebra College has a problem with attrition. A sizable number of nongraduating students do not return to classes each semester. Is attrition importantly related to status or gender? For each table below, calculate a lambda and answer how strong the association (if any) is.

 

 

 

Status

 

 

Attrition

Part-time

Full-time

Totals

Returned spring semester

42

353

395

Did not return

87

50

137

Totals

129

403

532

 

 

Gender

 

 

Attrition

Male

Female

Totals

Returned spring semester

322

73

395

Did not return

57

80

137

Totals

379

153

532

 

 

Answers

0.33 (Strong relationship, 33% reduction in errors)

Hint:

The errors with knowledge are (42+50). Circle the smaller number in each column. (For each column, you should choose the larger category as your prediction. For example, for the first column, your prediction should be “Did not return.” But, you are making errors with those people who actually “Returned spring semester.” So, 42 are the errors for this column. The errors with knowlege is 137.

0.05 (Little to very weak, 5% reduction in errors)