A department store claims that its average customer satisfaction rating is 28.5.We believe that this rating is too high, so we randomly sample 40 customers and find a sample average of 25.2.If the standard deviation of customer satisfaction for this store is 13.1, what is the probability of observing a sample at least this far below the claimed mean, assuming the claim is true?
A) 0.9441
B) 0.4013
C) 0.0559
D) 0.2500

Question

Quizplus · Accepted Answer

The Answer is C

A Department Store Claims That Its Average Customer Satisfaction Rating