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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 sample of 99 members of the website s premium program who recently made a purchase on the website yielded a mean of 1200 and a standard deviation of 250 Complete parts a and b below C a Construct a 90 confidence interval estimate for the mean spending for all shoppers who are members of the website s premium program Sus Round to two decimal places as needed b Interpret the interval constructed in a Choose the correct answer below OA With 90 confidence the mean spending in dollars for all shoppers who are members of the website s premium program is between the lower and upper limits of the confidence interval OB 90 of all shoppers who are members the website s premium program have spent an amount in dollars that is between the lower and upper limits of the confidence interval OC The sample mean spending in 90 of all samples of 99 members of the website s premium program will be between the lower and upper limits of the confidence interval D There is a 90 probability that mean spending in dollars for all shoppers who are members of the website s premium program is between the lower and upper limits of the confidence interval

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