In an effort to estimate the mean amount spent per customer for dinner at a well known restaurant in NE Minneapolis, data were collected for a sample of 80 customers. Assume the population standard deviation is $6.88. (a) What is the population of interest in this case? (b) Assuming a normal distribution and that this is a representative sample, what is the 95% coverage interval for amount spent per customer at this restaurant? (c) At 95% confidence, what is the margin of error? (d) If the sample mean is $24.80, what is the 95% confidence interval for the population mean? (e) Management is basing their planning on an average intake of $26.00 per customer. Should they be concerned