A local bookstore is keeping a database of its customers in order to find out more about their spending habits so that the store can start to make personal recommendations based on past purchases. The table lists the first rows of the store’s database.

a) What does a row correspond to in this data table? How would you best describe its role: as a participant, subject, case, respondent, or experimental unit?

b) How many variables are measured in each row?

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Transaction ID 29784320912 26483589001 Price $29.95 $16.99 $9.95 $35.00 Coupon? Customer ID ISBN Number of Purchase 345-23-2355 983-83-2739 102-65-2332 Gift? Date Quantity 11/12/2017 9/30/2017 9/30/2017 N 4J438 N 1 ЗК729 ЗК729 26483589002 36429489305 N 3U034 12/5/2017 295-39-5884 N 183-38-2957 36429489306 3U034 12/5/2017 $79.95 N 1