Accu-Copiers, Inc., sells and services the Accu-500 copying machine. As part of its standard service contract, the company agrees to perform routine service on this copier. To obtain information about the time it takes to perform routine service, Accu-Copiers has collected data for 11 service calls. The data are given on the left below, and the Excel output of a least squares line fit to these data is given on the right below.

a. The sample correlation coefficient r can be calculated to equal .9952 for the service time data. What does this value of r say about the relationship between x and y?
b. Predict the service time for a future service call on which five copiers will be serviced.

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Service Call Number of Copiers Serviced, x Number of Minutes Required, y 109 Copiers Line Fit Plot 200 58 138 189 37 82 103 134 68 112 154 150 S 100 50 Minutes 11.4641 24.6022 Copiers 10 Copiers, x