The first value in each point represents the x-value, while the second value in each point represents the y-value.
Press on the Stat-button and then on press on ENTER (by which we will select 1:Edit...).
Enter the x-value in the list L1 and enter y-values in the list L2.
Next press on STAT, press
Next press 2nd and STAT (to open the LIST-menu) and press ENTER to select 1:L1.
Next press on "," (comma). Then press 2nd and STAT (to open the LIST-menu), press
Finally, press enter again.
Result graphing calculator:
Unusual points Each of the four scatterplots that follow shows a cluster of points and one “stray” point. For each, answer these questions:
1) In what way is the point unusual? Does it have high leverage, a large residual, or both?
2) Do you think that point is an influential point?
3) If that point were removed, would the correlation be- come stronger or weaker? Explain.
4) If that point were removed, would the slope of the re- gression line increase or decrease? Explain
Straight Lines Graph the straight lines in Exercises 1–3.
Then find the change in y for a one-unit change in x, find the point at which the line crosses the y-axis, and calculate the value of y when x 52.5.
Scatterplots For the scatterplots in Exercises 5 describe the pattern that you see. How strong is the pattern? Do you see any outliers or clusters?