Length (mi) and Water Flow
Length: 2540, 1980, 1460, 1420, 1290, 1040, 886, 774, 724, 659
Flow: 76, 225, 41, 58, 56, 57, 68, 67, 67, 41
Length is on the horizontal axis and Flow is on the vertical axis.
The lengths range from 659 to 2540, thus an appropriate scale for the horizontal axis is from 500 to 2600.
The number of runs range from 41 to 225, thus an appropriate scale for the vertical axis is from 0 to 250.
Lenght is on the horizontal axis and Flow is on the vertical axis.
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
Make a scatterplot for the data.
Height and Weight of Females