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Please and explain how to do it please. Provide an appropriate response. A state highway patrol official wishes to estimate the number of legally intoxicated

Please and explain how to do it please.

Provide an appropriate response. A state highway patrol official wishes to estimate the number of legally intoxicated drivers on a certain road. a) How large a sample is needed in order to be 98% confident that the sample proportion will not differ from the true proportion by more than 2%? b) Repeat part (a) assuming previous studies found that 85% of the drivers on this road are legally intoxicated

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