A professor has noticed that, even though attendance is not a component of the f

Question

A professor has noticed that, even though attendance is not a component of the final grade for the class, students that attend regularly generally get better grades. In fact, 39% of those who come to class on a regular basis receive A's. Only 12% who do not attend regularly get A's. The long run attendance rate is 81%. Based on this class profile find the following:

Hint: pretend that there are 1000 students in the class and use the values given in the problem to construct the appropriate contingency table. Round cell frequencies to the nearest integer

I cannot figure out E) and F). What's that?

Explanation / Answer

E)

In fact, 39% of those who come to class on a regular basis receive A's, thus the odds that a person who attends regularly gets an "A" in the class is:

(39/(100 - 39)) = 39/61 = 0.639

F)

P(A|regular) = 0.39

P(A|not regular) = 0.12

The odds ratio of getting an A in the class for those attend regularly versus those who do not attend is:

0.39/0.12 = 13/4 = 3.25

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