Can you explain the changes that occurred when data was removed?.For which player does the removal of data have the greatest impact on the regression equation and r value? What does the change indicate? Repeat this process for each player in the list. Replace the data for Kobe Bryant, and remove the data for another player.How does this change the regression equation and r value? What is the correlation coefficient ( r) for this set of data?.In general, the closer | r| is to 1, the better the fit. If | r| = 1, the line is a perfect fit to the data if | r| = 0, the line does not fit the data at all. The correlation coefficient ( r) indicates how well the line approximates the data. Plot points scored along the horizontal axis and minutes along the vertical axis.Ĭheck the Show Line of Best Fit box to see a linear approximation of this data. (For this investigation, a "starter" is any player who averaged more than 20 minutes per game.) The data below shows the points scored and minutes played by the six "starters" for the Los Angeles Lakers during the 2004–05 season. You can reset the original parameters for the graph or use the Zoom to Fit box to have the graph automatically select parameters that will show all your points optimally.To see a different portion of the grid, highlight the Move Graph box and use the mouse to drag the graph around.Use the + and – Magnifying Glass to zoom. The grid can be zoomed in and out as more points are added. An equation of this line and the correlation coefficient ( r) will appear. When you check the box for Show Line of Best Fit, the area least-squares regression line will be displayed.A slope and y-intercept can also be entered to change the line of best fit. An equation of this line willĪppear to the right. Drag the purple dots toĪpproximate a line of best fit visually. You can also click‑and‑drag any point to change its location.Ī purple line will appear on the grid. Check the Remove Points box and click on any point to remove it.Plot points by clicking anywhere on the grid, or plot a set of points byĮntering a pair of coordinates in the text box and clicking Add Point.
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