Question: The mean amount of money spent per customer in a department of a retail shop in a resort shop is $44. The department manager claimed that he could increase this figure by stocking a new product. The new product was put on the shelves. A sample of 25 customers indicated a mean of $51.50 spent with a standard deviation of $7.60. Test the manager's claim at the alpha = .05 level of significance. Use six-step format