Answer Happy

A random sample of 200 voters in a town is selected, and 114 are found to support an annexation suit. How large a sample is needed to be 96% confident that a sample proportion of voters in a town found to support an annexation suit will be within 0.015 of the true fraction of the voting population? Click here to view page 1 of the normal probability table. Click here to view page 2 of the normal probability table. The sample size needs to be at least (Round up to the nearest whole number.) C
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.) C
(a) According a report in the Roanoke Times, approximately 2/3 of 2200 adults polled by telephone said they think the space shuttle program is a good investment for the country. Find a 95% confidence interval for the proportion of American adults who think the space shuttle program is a good investment for the country. (b) What can be asserted with 95% confidence about the possible size of the error if the proportion of American adults who think the space shuttle program is a good investment is estimated to be 2/3? Click here to view page 1 of the normal probability table. Click here to view page 2 of the normal probability table.