A bakery records whether the customer is a loyalty program member or not on each receipt.
Total purchase price for both members and non-members is skewed toward the higher
prices.
The bakery takes separate random samples of 45 receipts from members and non-members.
They look at the difference in the mean total price from each group
(member - non-member).
What do we know about the shape of the sampling distribution of TM - IN, and why?