The marketing director at Homecare Products wants to measure the response of customers to the company’s new cinnamon flavored toothpaste. Suppose she plans to take a simple random sample of customers and wants a margin of error no larger than .02 for a proposed 90% confidence interval estimate of the proportion of customers overall who would like the new flavor. How large a sample would you recommend? Assume you have no prior information about the likely population proportion.
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