Illinois State University Mathematics Department
MAT 312: Probability and Statistics for Middle School Teachers Dr. Roger Day (day@ilstu.edu) 
Assignment #3




Use the Couples' Ages data set, handed out in class, to complete the following tasks.
1. Create the equation for the medianmedian line of this data set, using husband's ages as the first element (x) of each ordered pair and wife's ages as the second element (y) in each ordered pair. Show all steps in the process as we illustrated in class and express your equation in slopeintercept form. You can check the equation of your medianmedian line using your calculator.
2. Use your calculator to generate the leastsquares linear regression equation for this data set, using husband's ages as the first element (x) of each ordered pair and wife's ages as the second element (y) in each ordered pair. Copy all the information your calculator shows you when you generate the leastsquares equation. Express your equation in slopeintercept form.
3. Calculate the sum of the squared error terms (SSE) for each of the models you just created (i.e., for the medianmedian line and for the leastsquares line). You are encouraged to use your calculator's "lists" features to carry out your calculations. Express each sum rounded to the nearest hundredth of a unit.
Complete this assignment using pencil and paper and bring it to class for discussion and submission. You may use a calculator for any parts of the assignment and copy the calculator information onto your paper.
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