In an effort to estimate the mean amount spent per customer for dinner at a major Atlanta restaurant, data were collected from 64 randomly selected customers. The sample mean was calculated as $27.75...

In an effort to estimate the mean amount spent per customer for dinner at a major Atlanta restaurant, data were collected from 64 randomly selected customers.  The sample mean was calculated as $27.75 with a sample standard deviation of $4.  We wish to develop a 91% confidence interval for the mean amount spent per customer for dinner at this restaurant.  Assume that the standard deviation of the amounts spent by ALL customers is $4.30.

The resulting 91% confidence interval is given by  27.75±0.91127.75±0.911

Based upon the above confidence interval, can it be concluded – with at least 91% confidence – that the average customer spends more than $25 at the restaurant?        AC YES NO                     ["", ""]               and Why?                             ["", "", "", ""]