S.J.8. Food-poisoning outbreaks are often the resul L of contamin ated salads. ln one sludy carried out to assess the magnitude of that problem, the New York City Department of Health exami.ned 220 tuna salads marketed by various retail and wholesale outlets. A total of l 79 were found to be unsatisfactory for health reasons (166). Find a 90% confidence interval for p, the lrue proportion of contaminated tuna salads marketed in New York City.
5.3.9. In 1927, lhe year he hil 60 home runs, Babe Ruth batted .356, having collected 192 hits in 540 official at-bats (145). Based on his performance that season, conslruct a 95% confidence interval for Ruth's probability of getting a hit in a future at-bat.
5.3.10.To buy a 30-second commercial break during lhe telecast of Super Bowl XXIX cost ap proximately $1,000,000. Not surprisingly, potential sponsors wanted to know how many people mighl be watching. In a survey of 1015 polential viewers, 281 said they expected to see less than a quarter of the advertisements aired during !.he game. Define the rele· vant parameter and eslimate it using a 90% confidence interval.
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