Question: Table 15 lists average annual telephone expenditures (in dollars) per consumer unit on residential phone service and cellular phone service, and the figure contains a

Table 15 lists average annual telephone expenditures (in dollars) per consumer unit on residential phone service and cellular phone service, and the figure contains a scatter plot and regression line for each data set.

(A) Interpret the slope of each model.
(B) Predict (to the nearest dollar) the average annual residential and cellular expenditures in 2015.
(C) Would the linear regression models give reasonable predictions for the year 2025? Explain

Table 15 Telephone Expenditures Residential Service (S) 686 641 620 592 570 542 482 Cellular Service ($) 210 294 316 378 455 524 608 Year 2001 2002 2003 2005 2006 2007 ioo 100 100 Figure for 26: telephone expenditures

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