James Dobbins, maintenance supervisor for the Atlanta Transit Authority, would like to determine whether there is a positive relationship between the annual maintenance cost of a bus and its age. If a relationship exists, James feels that he can do a better job of predicting the annual bus maintenance budget. He collects the data shown in Table P-ll.
a. Plot a scatter diagram.
b. What kind of relationship exists between these two variables?
c. Compute the correlation coefficient.

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TABLE P-11 Maintenance Age Cost (S) (ears) Bus 859 1.094 224 1.049 12