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15. A phone manufacturer wishes to estimate the proportion of people who want to purchase a...
A phone manufacturer wishes to estimate the proportion of people who want to purchase a cell...
A phone manufacturer wishes to estimate the proportion of people who want to purchase a cell phone which costs more than $800. Find the required sample size to yield a 90% confidence interval whose length is below 0.02.
A tablet PC manufacturer wishes to estimate the proportion of people who want to purchase tablet...
A tablet PC manufacturer wishes to estimate the proportion of people who want to purchase tablet PCs which cost more than $700. Find the required sample size to yield a 90% confidence interval whose length is below 0.04.
A pollster wishes to estimate, with 95% confidence, the proportion of people who approve of how...
A pollster wishes to estimate, with 95% confidence, the proportion of people who approve of how President Trump is performing his job. Find the minimum sample size necessary to achieve a margin of error of less than 3%. Assuming no previous estimates are available. Round your answer up to the next integer. Assuming a previous estimate of 0.90. Round your answer up to the next integer
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size...
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.02 with 90% confidence if a) she uses a previous estimate of 0.34? b) she does not use any prior estimates? a) nequals nothing (Round up to the nearest integer.) b) nequals nothing (Round up to the nearest integer.)
a researcher wishes to estimate the proportion of adults who have high spped internet access ....
a researcher wishes to estimate the proportion of adults who have high spped internet access . what size sample should be obtained if she wishes the estimate to be within 0.05 with 90% confidence if she uses a previous estimate of 0.46
A researcher wishes to estimate the proportion of adults who have high-speed internet access. What size...
A researcher wishes to estimate the proportion of adults who have high-speed internet access. What size sample should be obtained if she wishes to estimate to be within 0.02 with 95% confidence if (a) She uses a previous estimate of 0.38? (b) she does not use any prior estimates?
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size...
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.02 with 95% confidence if (a) she uses a previous estimate of 0.42? (b) she does not use any prior estimates?
A researcher wishes to estimate the proportion of adults who have high-speed Internet access.
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.01 with 90% confidence if (a) she uses a previous estimate of 0.46? (b) she does not use any prior estimates?
A sociologist wants to construct a 90% confidence interval for the proportion of children aged 8-10...
A sociologist wants to construct a 90% confidence interval for the proportion of children aged 8-10 living in New York who own a cell phone. A survey by the National Consumers League taken in 2012 estimates the nationwide proportion to be 0.42. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.02?
A sociologist wants to construct a 90% confidence interval for the proportion of children aged 8-10...
A sociologist wants to construct a 90% confidence interval for the proportion of children aged 8-10 living in New York who own a cell phone. A survey by the National Consumers League taken in 2012 estimates the nationwide proportion to be 0.42. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.02?
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