A local bookstore is keeping a database of its customers to find out more about
ID: 3260921 • Letter: A
Question
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.
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 are these cross-sectional? Explain briefly.
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a) Describe the variable Transaction ID. Choose the correct answer below.
A.
The variable Transaction ID is categorical and ordinal.
B.
The variable Transaction ID is categorical and nominal, but could not be described as an identifier variable.
C.
The variable Transaction ID is quantitative, with units counts.
D.
The variable Transaction ID is categorical and nominal, and could also be described as an identifier variable.
Describe the variable Customer ID. Choose the correct answer below.
A.
The variable Customer ID is categorical and ordinal.
B.
The variable Customer ID is categorical and nominal, and could also be described as an identifier variable.
C.
The variable Customer ID is quantitative, with units counts.
D.
The variable Customer ID is categorical and nominal, but could not be described as an identifier variable.
Describe the variable Date. Choose the correct answer below.
A.
The variable Date is categorical and nominal, and could also be described as an identifier variable.
B.
The variable Date is categorical and nominal, but could not be described as an identifier variable.
C.
The variable Date is quantitative, with units days.
D.
The variable Date is quantitative, with units counts.
Describe the variable ISBN Number of Purchase. Choose the correct answer below.
A.
The variable ISBN Number of Purchase is quantitative, with units counts.
B.
The variable ISBN Number of Purchase is categorical and nominal, and could also be described as an identifier variable.
C.
The variable ISBN Number of Purchase is categorical and nominal, but could not be described as an identifier variable.
D.
The variable ISBN Number of Purchase is categorical and ordinal.
Describe the variable
Price.
Choose the correct answer below.
A.
The variable Price is categorical and ordinal.
B.
The variable Price is categorical and nominal, and could also be described as an identifier variable.
C.
The variable Price is categorical and nominal, but could not be described as an identifier variable.
D.
The variable Price is quantitative, with units dollars.
Describe the variable
Coupon.
Choose the correct answer below.
A.
The variable Coupon is categorical and ordinal.
B.
The variable Coupon is categorical and nominal, and could also be described as an identifier variable.
C.
The variable Coupon is quantitative, with units counts.
D.
The variable Coupon is categorical and nominal, but could not be described as an identifier variable.
Describe the variable
Gift.
Choose the correct answer below.
A.
The variable Gift is categorical and nominal, and could also be described as an identifier variable.
B.
The variable Gift is categorical and nominal, but could not be described as an identifier variable.
C.
The variable Gift is quantitative, with units counts.
D.
The variable Gift is categorical and ordinal.
Describe the variable Quantity. Choose the correct answer below.
A.
The variable Quantity is categorical and ordinal.
B.
The variable Quantity is categorical and nominal, and could also be described as an identifier variable.
C.
The variable Quantity is quantitative, with units counts.
D.
The variable Quantity is quantitative, with units dollars.
b) 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 are several variables measured at single points in time.
B.
These data are a time series. There is a single variable measured at multiple points in time.
C.
These data are cross-sectional. There is a single variable measured at multiple points in time.
D.
These data are a time series. There are several variables measured at single points in time.
Click to select your answer.
Transaction ID
Customer ID
Date
ISBN Number of Purchase
Price $
Coupon?
Gift?
Quantity
28784320912
4J343
11/12/2009
345-29-2367
$25.95
N
N
1
26483589099
3K727
9/29/2009
987-87-2744
18.99
N
N
1
26483589100
3K727
9/29/2009
102-73-2324
9.95
Y
N
1
35429489305
3U036
12/7/2009
295-43-5892
33.00
N
Y
1
35429489306
3U036
12/7/2009
223-42-2964
78.95
N
Y
1
Explanation / Answer
1. Transaction ID : There is no order in transaction id. So, the transaction ID is a categorical and nominal variable and it can also used as an identifier of transaction. So the answer is (D)
2. Customer ID: Same logic applies here also. So the answer is (B)
3. Date : The variable date is quantitative, with unit days. Answer is (C)
4. ISBN Number of Purchase : Is same as Transaction ID. So the answer is (B)
5. Price : Price is a quantitative variable with unit dollars. Answer is (D)
6. Coupon is categorical and nominal. that is "Y" or "N". But it is not an identifier. Answer is (D)
7. Gift is of same type as Coupon. So the answer is (B)
8. Quantity is a count variable, by meaning it is quantitative. So the answer is (C).
9. This data is a cross-sectional data. There are several variables measured at a single point in time. At a particular date, we are capturing inputs for several variable. So the answer is (A)
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