Direct mail advertisers send solicitations (junk mail)

to thousands of potential customers hoping that some

will buy the product. The response rate is usually quite

low. Suppose a company wants to test the response

to a new flyer and sends it to 1,000 randomly selected

people. The company gets orders from 123 of the

recipients and decides to do a mass mailing to

everyone on its mailing list of over 200,000. Create a

95% confidence interval for the percentage of those

people who will order something.