handout13 - Class Exercise Week 13 STAT 3022, section 001...

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Class Exercise – Week 13 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 Binge Drink Never 446 4617 Occasionally 915 2047 Frequently 1959 1176 (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. (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 of Missed Class. (d) What is the proportion of students in our sample who never binge drink? What is the proportion who occasionally binge drink? What is the proportion who frequently binge
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handout13 - Class Exercise Week 13 STAT 3022, section 001...

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