Question 1
A local men's clothing store is being sold. The buyers are trying to estimate the percentage of items that are outdated. They will choose a random sample from the 100,000 items in the store's inventory in order to determine the proportion of merchandise that is outdated. The current owners have never determined the percentage of outdated merchandise and cannot help the buyers. How large a sample do the buyers need in order to be 95% confident that the margin of error of their estimate is about 5%?
◦ 385
◦ 196
◦ 1537
◦ 769
Question 2
A confidence interval was used to estimate the proportion of statistics students who are female. A random sample of 72 statistics students generated the following confidence interval:
Using the information above, what sample size would be necessary if we wanted to estimate the true proportion to within 3% using 99% reliability?
◦ 1842
◦ 1769
◦ 1831
◦ 1916
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