handout13sol

handout13sol - Class Exercise Week 13 (Solutions) STAT...

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Class Exercise – Week 13 (Solutions) STAT 3022, section 001 12/02/2011 Analysis of r × c Table. Consider the following 3 × 2 table of counts. Students at a public university were categorized by how often they binge drink (never, occasionally, or frequently) and by whether they missed a class that semester. Missed Class Yes No Totals Binge Drink Never 446 4617 5063 Occasionally 915 2047 2962 Frequently 1959 1176 3135 Totals 3320 7840 11160 (a) Calculate the marginal totals R 1 ,R 2 ,R 3 ,C 1 ,C 2 , and T . (b) For each cell in the table, what is the overall proportion of students in that cell? For example, the overall proportion of students in cell ( i,j ) is n ij /T . The distribution of these proportions is called the joint distribution of the row and column variables. Missed Class Yes No Binge Drink Never 0.040 0.414 Occasionally 0.082 0.183 Frequently 0.176 0.105 (c) What is the proportion of students in our sample who missed class? What is the proportion who didn’t miss class? This is the marginal distribution
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This note was uploaded on 01/22/2012 for the course STAT 3022 taught by Professor Staff during the Fall '08 term at Minnesota.

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handout13sol - Class Exercise Week 13 (Solutions) STAT...

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