1. Is it proper to multiply the average order size, $42.33, by the number of addresses (1,300,000) in the target mailing?
2. Is it better, as suggested, to multiply the endpoints of the confidence interval by the target mailing size?
3. Would it be better to multiply by the size of the frame used to select the random sample?
4. Should anything else trouble you about this situation?
5. What is your best estimate, with confidence limits, for potential catalog sales?