(a) Set up a coordinate system with the horizontal t-axis
Chapter 1, Problem 22(choose chapter or problem)
(a) Set up a coordinate system with the horizontal t-axis (running from 0 to at least 6) representing years af-ter 1990 and the vertical P-axis (running from 14 to at least 27) representing percentage of sales due to imports; then use it to plot the data in Table B below. Note: you should use a broken vertical axis as in Figures 11 through 13. (b) What are the coordinates of the point in your graph that corresponds to the data for 1990? For 1992? (c) Use the midpoint formula with the two points that you listed in part (b) to estimate the percentage of import sales for the year 1991. (Round the answer to one decimal place.) (d) Compute the percentage error in the estimate in part (c), given that the actual 1991 value is 24.9%. [The formula for percentage error is given in Example 5(c).] TABLE B Percentage of Retail New Car Sales in United States due to Imports, 19901996 Year 1990 1992 1994 1996 Percentage due to imports 25.8 23.6 19.3 14.9 Source: American Automobile Manufacturers Assn.
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