This activity allows the user to enter a set of data, plot the data on a coordinate grid, and determine the equation for a line of best fit.
Plot points by clicking anywhere on the grid, or plot a set of points by entering a pair of coordinates in the text box and clicking Add Point.
Check the Remove Points box and click on any point to remove it. You can also click‑and‑drag any point to change its location.
When you check the box for Student Guess, a purple line will appear on the grid. Drag the purple dots to approximate a line of best fit visually. An equation of this line will appear to the right. A slope and y-intercept can also be entered to change the line of best fit. When you check the box for Show Line of Best Fit, the area least-squares regression line will be displayed. An equation of this line and the correlation coefficient (r) will appear.
Plot points scored along the horizontal axis and minutes along the vertical axis.
Check the Computer Fit box to see a linear approximation of this data. The correlation coefficient (r) indicates how well the line approximates the data. If |r| = 1, the line is a perfect fit to the data; if |r| = 0, the line does not fit the data at all. In general, the closer |r| is to 1, the better the fit.
You can conduct similar investigations for other sports by looking at the statistics for Major League Baseball (MLB), National Football League (NFL), Women's National Basketball Association (WNBA), Major League Soccer (MLS), or other sports that interest you.
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