Suppose that a manager is interested in estimating the average amount of money customers spend in her store. After sampling 36 transactions at random, she found that the average amount spent was $37.85. She then computed a 99% confidence interval to be between $32.89 and $ 42.81. Which statement gives a valid interpretation of the interval? a. The store manager is 99% confident that the average amount spent by all customers is between $32.89 and $42.81.
b. There is a 99% chance that the mean amount spent by all customers is between $32.89 and $42.81.
c. There is a 99% chance that a randomly selected customer will spend between $32.89 and $42.81.
d. The store manager is 99% confident that the average amount spent by the 36 sampled customers is between $32.89 and $ 42.81