Suppose an investigator has studied the possible association between the use of a weight loss drug and a rare central nervous system (CNS) disorder. He samples from a group of volunteers with and without the disorder, and records whether they have used the weight loss drug. The data are summarized in the following table:

(a) Can these data be used to estimate the probability of a CNS disorder for someone taking the weight loss drug?

(b) For this study, what is an appropriate measure of association between the weight-loss drug and the presence of CNS disorder?

(c) Calculate the measure of association specified in part (b).

(d) Interpret the calculation from part (c).

(e) What test of significance is the best choice for analyzing the hypothesis of no association for these data?

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Drug Use CNS disorder Yes No Yes 10 2000 No 7 4000