Answered: he drug Viagra became available in the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The drug Viagra became available in the U.S. in May 1988, in the wake of an advertising campaign that was unprecedented in scope and intensity. A Gallup poll found that by the end of the first week of May, 643 out of 1,005 adults were aware that Viagra was an impotency medication.

a) Is the sample size large enough to compute a confidence interval for the proportion of adults who were aware that Viagra was an impotency medication after the first week of May?

Yes, because more than 10 adults were not aware of Viagra

Yes, because the sample size is greater than 30

Yes, because more than 10 adults were aware of Viagra

Yes, because both np̂ and n(1-p̂) are greater than 10

b)Using the information from questions 1-3, suppose that p̂ is 0.40 and the standard error of p̂ is 0.10. Compute a 90% confidence interval for the proportion of adults that were aware of Viagra.

(0.2355, 0.5645)

(0.3, 0.5)

(0.2355, 0.4)

(0.3, 0.4)

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