Cell phone company needs to know the proportion of adults who only use cell phones, no land-lines. Assume that you want to be 90% confident that the sample percentage is within 1 % of the true population percentage. How many adults must you survey? Assume from previous studies 73 % use only cell phones.
Added by Christopher V.
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Step 1: Calculate the Z-value for a 90% confidence level. Show more…
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Cell phone company needs to know the proportion of adults who only use cell phones, no land-lines. Assume that you want to be 90% confident that the sample percentage is within 1 % of the true population percentage. How many adults must you survey? Assume nothing is known about the population proportion.
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