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 $1800 and a standard deviation of $250. Complete parts (a) and (b) below. a. Construct a 95% 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. O A. The sample mean spending in 95% of all samples of 99 members of the website's premium program will be between the lower and upper limits of the confidence interval. O B. With 95% 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. O C. There is a 95% 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. O D. 95% of all shoppers who are members of the website's premium program have spent an amount in dollars that is between the lower and upper limits of the confidence interval