Modeling using Stat Menus

Problem:

Many companies in the United States manufacture or assemble their products abroad to save on labor costs. For example, the toy industry in the U. S. imports approximately 30% of its products from China, (GI Joe and Teenage Mutant Ninja Turtles are assembled in China.) The following table shows the dollar value of these imports during the period 1986 – 1990. Year Imports (billions of dollars) 1986 0.237 1987 0.509 1988 0.765 1989 1.317 1990 1.547 Let's make an adjustment with the data. Let x = 0 for the year 1986. So y = 4 for the year 1990 Let y represent the import values. I. Choose Stat. Edit Menus Put x–values in L1 and y–values in L2

II.	Make a scatter Plot
	Use 2nd Stat. Plot Menus
	Select Plot 1 by pressing enter.
	Turn Plot 1 on and make following selections:

III.	Show Scatter Plot
	Select Zoom Stat. (#9)
	Should see scatter plot

IV.	To find the Linear Regression Equation (See Below for Ti83)
	Find the regression equation,by selecting the Stat. Calc. Menus.
	Choose LinReg(ax+b) or (#5) and press enter. See

V.	Copy Regression equation in y1 .
	Press y = and move cursor to y1
	Choose Vars Menus.
	Select Statistics or #5
	Choose Eq followed by RegEq #7. See

Select the Graph Menus. Should see the the following

	TI83: Follow Step I– III above and Step V below.
V..	To find the Linear Regression Equation
	Choose LinReg from Stat. Calc. Menus.
	Enter function in y1 by choosing Vars, Y–Vars , Function. Select y1 or y2 etc.
	See on screen, LinReg y1 or y2.
	Press Enter. See coefficients of Linear Equation
	To see Graph, Press graph.

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