Chapter 14, Problem 4CRE

Internet Doctors: Probability Based on the survey data given in Exercise 1, assume that 55% of adults learn about medical symptoms more often from the Internet than from their doctor.

a. Find the probability that three randomly selected adults all learn about medical symptoms more often from the Internet than from their doctor.

b. Find the probability that when three adults are randomly selected, at least one of them learns about medical symptoms more often from the Internet than from their doctor.

1. Internet Doctors: Confidence Interval In a survey of n = 2015 adults. 1108 of them said that they learn about medical symptoms more often from the Internet than from their doctor (based on a MerckManuals.com survey). Use the data to construct a 95% confidence interval estimate of the population proportion of all adults who say that they learn about medical symptoms more often from the Internet than from their doctor. Does the result suggest that the majority of adults learn about medical symptoms more often from the Internet than from their doctor?