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. The first 5 lines of the database appear in the accompanying table.

Transaction ID	Customer ID	Date	ISBN Number of Purchase	Price	Coupon?	Gift?	Quantity
29784320917	4J437	11/15/2009	345-25-2364	$35.95	N	N	1
26483689001	3K726	9/30/2009	839-80-2743	$17.99	N	N	1
26483689002	3K726	9/30/2009	110-63-2338	$9.95	Y	N	1
36429489306	3U034	12/9/2009	285-36-5892	$30.00	N	Y	1
36429489307	3U034	12/9/2009	180-44-2951	$77.95	N	Y	1

1. Describe the variable Transaction ID. Choose the correct answer below.

A. The variable Transaction ID is categorical and nominal.

B. The variable Transaction ID is an identifier variable.

C. The variable Transaction ID is quantitative, with unit counts.

D. The variable Transaction ID is categorical and ordinal.

2. Describe the variable Customer ID. Choose the correct answer below.

A. The variable Customer ID is quantitative, with units counts.

B. The variable Customer ID is categorical and ordinal.

C. The variable Customer ID is an identifier variable.

D. The variable Customer ID is categorical and nominal.

3. Describe the variable Date. Choose the correct answer below.

A. The variable Date is categorical and ordinal.

B. The variable Date is categorical and nominal.

C. The variable Date is quantitative, with unit days.

D. The variable Date is quantitative, with unit counts.

4. Describe the variable ISBN Number of Purchase. Choose the correct answer below.

A. The variable ISBN Number of Purchase is categorical and ordinal.

B. The variable ISBN Number of Purchase is quantitative, with units counts.

C. The variable ISBN Number of Purchase is categorical and nominal.

D. The variable ISBN Number of Purchase is an identifier variable.

5. Describe the variable Price. Choose the correct answer below.

A. The variable Price is an identifier variable.

B. The variable Price is categorical and ordinal.

C. The variable Price is categorical and nominal.

D. The variable Price is quantitative, with unit dollars.

6. Describe the variable Coupon. Choose the correct answer below.

A. The variable Coupon is an identifier variable.

B. The variable Coupon is categorical and nominal.

C. The variable Coupon is categorical and ordinal.

D. The variable Coupon is quantitative, with unit counts.

7. Describe the variable Gift. Choose the correct answer below.

A. The variable Gift is categorical and nominal.

B. The variable Gift is categorical and ordinal.

C. The variable Gift is an identifier variable.

D. The variable Gifts is quantitative, with units counts.

8. Describe the variable Quantity. Choose the correct answer below.

A. The variable Quantity is quantitative, with unit counts.

B. The variable Quantity is categorical and ordinal.

C. The variable Quantity is quantitative, with unit dollars.

D. The variable Quantity is categorical and nominal.

9. Are these data a time series, or are these cross-sectional? Explain Briefly. Choose the correct answer below.

A. These data are cross-sectional. There is a single variable measure at multiple points in time.

B. These data are cross-sectional. There are several variable measured at single points in time.

C. These data are a time series. There are several variables measured at single points in time.

D. These data are a time series. There is a single variable measured at multiple points in time.