Your daily revenues at the store you own average $3200 per day. You wish to see if Saturday has more sales on average that the other days of the week. In a sample of the last 52 Saturdays the average revenues were $3350 with a standard deviation of $500.

a) At the .01 level did you statistically significant more sales on Saturday? (p = .018)

b) Interpret the p-value

c) The 99% confidence interval says "lower bound for mu is "3188 or more". Interpret what this means in context of the problem

d) How do you explain the difference between the $150 increase in sales on Saturdays based on the results of your test in a)

e) What is the only type of error that could have been made in this problem?