In some situations involving proportions, we are interested in the ratio p1p2 rather
Chapter 10, Problem 10-99(choose chapter or problem)
In some situations involving proportions, we are interested in the ratio p1p2 rather than the difference p1 p2. Let . We can show that ln( ) has an approximate normal distribution with the mean ( ) and variance (a) Use the information above to derive a large-sample confidence interval for ln . (b) Show how to find a large-sample CI for . (c) Use the data from the St. Johns Wort study in Example 10-15, and find a 95% CI on p1p2. Provide a practical interpretation for this CI.
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