A local bookstore is keeping a database of its customers to find out more about their spending habits and so that the store can start to make personal recommendations based on past purchases. Here are the first five rows of their 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 on each row?

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Transaction ID Customer ID Date ISBN Number of Purchase Price Coupon? Gift? Quantity 29784320912 4J438 11/12/2009 345-23-2355 $29.95 N N 1 26483589001 3K729 9/30/2009 983-83-2739 $16.99 N N 26483589002 3K729 9/30/2009 102-65-2332 $9.95 Y N 36429489305 30034 12/5/2009 295-39-5884 $35.00 N Y 36429489306 3U034 12/5/2009 183-38-2957 $79.95 N Y 1