What do your eyes tell you about the Form and Direction of the data? If the form is linear, approximate the r-value.

Reminder:

  • −1 is the strongest possible negative correlation, and +1 is the strongest possible positive correlation

  • 0 means no correlation

  • ±0.65 or ±0.70 or more is typically considered a "strong correlation"

  • ±0.35 to ±0.65 is typically considered “moderately correlated”

  • Anything less than about ±0.25 or ±0.35 may be considered weak

A

Linear Regression plot showing a line sloping down and to the right as it passes through a loosely-clumped collection of points

Form:

r close to:

B

Linear Regression plot showing a line sloping down and to the right as it passes through a tightly clustered collection of points

Form:

r close to:

C

A point cloud filling most of the screen top to bottom and left to right

Form:

r close to:

D

Linear Regression plot showing a line sloping up and to the right as it passes through a cloud of points that fills nearly half the image

Form:

r close to:

E

Linear Regression plot showing a line passing through a cloud of points in the bottom left and a much smaller number of points as the line continues up and to the right

Form:

r close to:

F

Scatterplot with points spaced along both the x and y-axes and a very dense blob of points completely saturating much of the space in between

Form:

r close to:

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