r me to read. A local bookstore is keeping a database of its customers to find out more about their spending habits so that the store can start to make personal recommendations based on past purchases. Here are the first five rows of their database: Transaction ID Customer ID Date ISBN Number Price Coupon? Gift? Quantity 29784320912 4J438 11/12/2009 345-23-2355 $29.95 26483589001 3K729 9/30/2009 983-83-2739 $16.99 26483589002 3K729 9/30/2009 102-65-2332 $9.95 ZZZXX ZZ>ZZ 36429489305 3U034 12/5/2009 295-39-5884 $35.00 36429489306 34034 12/5/2009 183-38-2957 $79.95 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? c) For each variable, would you describe it as primarily categorical, or quantitative? If quantitative, what are the units? If categorical, is it ordinal or simply nominal