The enrollments in an elementary algebra course at the College of San Mateo are shown in Table 13 for various Tuesdays leading up to the first day of class on Tuesday, January 17.

Let E be the enrollment in the elementary algebra course at t weeks since November 22.
a. Construct a scatterplot.
b. Describe the four characteristics of the association. Compute and interpret r as part of your analysis.
c. Find an equation of a linear model.
d. Graph the model on the scatterplot. Verify that the line passes through the two points that you chose in finding the equation in part (c) and that it comes close to all of the data points.

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Table 13 Enrollments in an Elementary Algebra Course Number of Weeks since November 22 0 Date Enrollment November 22 November 29 December 6 December I3 December 20 December 27 January 3 12 13 16 18 19