MATH121
Linear Regression on TI-92
1. Enter lists | |
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Clear a data matrix for use |
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Use Data/Matrix Editor This is a New variable |
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Type in a variable name; xyvars' |
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Enter x values in c1 and y values in c2;
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2. Graph the data | |
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Plot setup |
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Define Scatter Box |
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x's are in column 1 |
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y's are in column 2 |
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Save the plot definition; return to plot setup screen |
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Go to the Y = screen; check Plot 1; uncheck the rest |
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ZoomData; the data is plotted |
3. Do the linear regression; the equation will be of the form y(x) = ax + b | |
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Quit |
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Use Data/Matrix Editor and current data |
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Do LinReg |
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Use x's from column 1 |
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Use y's from column 2 |
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Store RegEQ to y1(x) |
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Values of a, b, corr, and r2 appear on screen; a = slope; b = y intercept; corr = r |
4. The linear regression equation is in y1; graph it | |
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Go to the Y = screen |
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ZoomData; regression line is graphed with data points |
5. Use the regression line to make predictions | |
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Go to the Home screen |
y1(20) ![]() |
Evaluate the regression equation y1 at 20 (or the value of your choice) |
6. When regression is completed, turn scatter plots off | |
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Go to the Y = screen and highlight Plot 1: |
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Uncheck Plot 1: |