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A marketing researcher wants to estimate the mean amount spent ($) on a certain retail website by members of the website's premium program. A random

A marketing researcher wants to estimate the mean amount spent ($) on a certain retail website by members of the website's premium program. A random sample of 93 members of the website's premium program who recently made a purchase on the website yielded a mean of $1900 and a standard deviation of $200. Complete parts (a) and (b) below.

a. Construct a 99% confidence interval estimate for the mean spending for all shoppers who are members of the website's premium program.

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