This is the answer to the problem via a chegg solution manual. But why isn\'t th

Question

This is the answer to the problem via a chegg solution manual. But why isn't this right:

odds in favor of head ache: 0.159/(1-.159)= 159/841---> 159:841

0.159 is from 117/(117+617) <------this ratio is where i went wrong it seems, so why is it wrong?

odds against headache: 841:159

Headaches and Viagra. In Exercises, use the data in the accompanying table (based on data from Pfizer. Inc.). That table describes results from a clinictd trial of the wellknown drug Viagra. For those in the Viagra treatment group, find the odds in favor of a headache, then find the odds against a headache. Viagra Treatment Placebo Headache 117 No Headache 617 696 Step-by-step solution Step 1 of 3 A Given table describes the results from a clinical trial of well-known drug Viagra Viagra Treatment Placebo Headache No Headache 617 696

Explanation / Answer

Your approch is wrong. Since you are calculationg the convertion of probabities to odds. But odds calculation if favor is seems to right in the solution manual. Since the odds in favor is defined as the number of success:number of failure. but you are calculating odds ratio.

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