LW03Regression

# LW03Regression - Lecture Worksheet#3 Name Section Number 1...

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Lecture Worksheet #3 Name:_____________________________________ Section Number _______ 1. The following data was collected during the 2000 U.S. Census. The data is the Median income in the U.S. for different ages. Age in years (rounded to the nearest 10) 20 30 40 50 60 70 Median Income 22,000 40,000 46,000 53,000 42,000 20,000 a. Enter the data into your calculator and draw a scatterplot. Briefly describe the shape of the data. b. Use your calculator to find a linear regression equation for the data. Make sure that you store the model in Y1. Write down the equation. c. Write down the values for r and R-Sq. d. What do the values of r and R-Sq tell you about this linear model? e. Plot the data along with the linear model and sketch it here.

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f. Based on the shape of the scatterplot and the fit of the linear model to the data, do the values of r and R-Sq surprise you? Why or why not? g. Enter the predicted values into L3 and the Residuals into L4. h.
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LW03Regression - Lecture Worksheet#3 Name Section Number 1...

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