Use the data in books.dat for this problem. a. Plot replace vs. purchase for the raw data.

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Use the data in books.dat for this problem.
a. Plot replace vs. purchase for the raw data.
b. Plot replace vs. purchase using the sampling weights.
c. Using a design-based approach, estimate the regression equation for predicting replace from purchase, along with its standard error. How many df would you use in constructing a CI for the slope?
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