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A manufacturer of MP3 players conducts a set of comprehensive tests on the electrical functions of its product. All MP3 players must pass all tests prior to being sold. Of a random sample of 800 MP3 players, 24 failed one or more tests. Find a 90% confidence interval for the proportion of MP3 players from the population that pass all tests. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. The 90% confidence interval is <p< (Round to three decimal places as needed.)
In a random sample of 1000 homes in a certain city, it is found that 229 are heated by oil. Find 99% confidence intervals for the proportion of homes in this city that are heated by oil using both of the accompanying methods for computing large-sample confidence intervals for p. Click here to view the methods for large-sample confidence intervals for p. Click here to view page 1 of the normal probability table. Click here to view page 2 of the normal probability table. The confidence interval using method 1 is 0.195 <p< 0.263 (Round to three decimal places as needed.) The confidence interval using method 2 is <p< (Round to four decimal places as needed.) (…)