Referring to the bookstore data table of Exercise 2,

a) 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?

b) Are these data a time series or cross-sectional? Explain briefly.

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Transaction ID Customer ID Date ISBN Number of Purchase Price Coupon? Gift? Quantity 29784320912 4J438 11/12/2017 345-23-2355 $29.95 N N 1 26483589001 3K7 29 9/30/2017 983-83-2739 $16.99 N 1 26483589002 ЗК729 9/30/2017 102-65-2332 $9.95 Y 1 36429489305 3U034 12/5/2017 295-39-5884 $35.00 Y 1 36429489306 3U034 12/5/2017 183-38-2957 $79.95 Y 1