SOLUTION: PLEASE i need your help Consider the accompanying contingency table, which presents the results of an advertising survey about the use of credit by Martan Oil Company customers.

Question 696921: PLEASE i need your help
Consider the accompanying contingency table, which presents the results of an advertising survey about the use of credit by Martan Oil Company customers.
Number of Purchases at Gasoline Station Last Year
Preferred Method of Payment
0�4
5�9
10�14
15�19
≥20
Sum
Cash
150
100
25
0
0
275
Oil-Company Card
50
35
115
80
70
350
National or Bank Credit Card
50
60
65
45
5
225
Sum
250
195
205
125
75
850
a. How many customers were surveyed?
b. Why are these bivariate data? What type of variable is each one?
c. How many customers preferred to use an oil-company credit card?
d. How many customers made 20 or more purchases last year?
can some one walk me through this PLEASE!!!
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Please post your data in contingency rectangle format.
Cheers,
Stan H.
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