Question

# Use your calculator to find the least-squares regression line of guessed calories on true calories. Do this twice, first for all 10 data points and then leaving out spaghetti and snack cake.

Solution

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To find the least-squares regression line for all ten data points using a calculator, enter the correct calorie data into list $L_{1}$ and the guessed calorie data into list $L_{2}$. Then key this sequence: STAT / CALC / 8:LinReg(a+bx) / ENTER. To find the least-squares regression line after leaving out spaghetti and snack cake, enter the correct calorie data minus those two points into list $L_{1}$ and the guessed calorie data minus those two points into list $L_{2}$. Then key this sequence: STAT / CALC / 8:LinReg(a+bx) / ENTER.

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