For a Sample of 200 Recent Credit-Card Customers of a Company's

For a sample of 200 recent credit-card customers of a company's on-line store,the following data are available: the dollar amount of merchandise ordered during the visit,how much time (minutes)the customer spent at the site during the purchase visit,and whether the customer used a Visa,Master Card,or other.Describe the format of a linear regression equation for estimating the dollar amount of the order on the basis of the other variables described above.If any qualitative variables are used,indicate the strategy for coding them.