Statistics with
The TI-86
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
.237
1987
.509
1988
.765
1989
1.317
1990
1.547
Let 0 represent 1986, 1 represent 1987 etc
Choose Stat Edit
Put x values in List 1
Put y values in List 2
Freq. Enter 1. Should see table below
Select Stat, Plot. Should see screen below
Select Plot 1
Turn Plot 1 on. Should see screen below
Select Graph Wind. Define window as below
Select Stat, Draw, Scat
See Scatter Plot below
Choose Stat, Calc, Lin R , Enter
Select LinR and Enter. See Reg. Eq.as shown below
Choose Stat Draw More DRREG. See graphed line below
To clear this drawing, select the Graph More Draw MoreTwice CLDW. See screen below
To write equation in y =: Quit
Choose Stat Calc. With the Calc LinReg menus showing, Press More twice and select StorEq.

Store Regression equation in letter B by pressing Alpha Band Enter. See screen below
Go to y= menus, Select location y1 or y2 etc, Type in the letter B.Press Graph See screen below
You could Choose STPIC .To store picture choose Quit. Select Stat Draw More STPIC. Name will appear on the screen. Press C Enter to store picture in C. Do not need to press Alpha key.
To recall picture. First clear the above drawing by selecting Graph More Draw MoreTwice CLDW. Choose Stat Draw More RCPIC. Name appears at the lower left corner of screen. Enter the letter C and Enter. See the picture below
Quit.
To Make Prediction: Select Stat More FCST. See screen below
To make a prediction, Enter the value for x and move the cursor to y and press solve.

Back