18. Junk mail. Direct mail advertisers send
Chapter 19, Problem 18(choose chapter or problem)
18. Junk mail. Direct mail advertisers send solicitations(a.k.a. junk mail) to thousands of potential customersin the hope that some will buy the companys product.The acceptance rate is usually quite low. Suppose a companywants to test the response to a new flyer, and sendsit to 1000 people randomly selected from their mailing listof over 200,000 people. They get orders from 123 of therecipients.a) Create a 90% confidence interval for the percentage ofpeople the company contacts who may buy something.b) Explain what this interval means.c) Explain what 90% confidence means.d) The company must decide whether to now do a massmailing. The mailing wont be cost-effective unless itproduces at least a 5% return. What does your confidenceinterval suggest? Explain.
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