Remember what we learned about r-values…​

r = -1

r = -0.5

r = 0

r = 0.5

r = 1

perfect negative correlation

moderate negative association

no correlation

moderate positive association

perfect positive correlation

For each of the scatter plots below, draw a predictor line that seems like the best fit. Describe the correlation in terms of Direction and whether you think it is generally stronger or weaker, then estimate the r-value as being close to -1, -0.5, 0, +0.5, or +1.

A

scatterplot of points tightly clustered around a line sloping up and to the right

Direction:

Positive

Negative

None

Strength:

Stronger

Weaker

estimated r:

-1 -0.5 0 0.5 1

B

scatterplot f dispersed points tending toward decreasing in vertical position as the horizontal position increases

Direction:

Positive

Negative

None

Strength:

Stronger

Weaker

estimated r:

-1 -0.5 0 0.5 1

C

scatterplot of points curving slightly around what would be a line sloping downward from left to right.

Direction:

Positive

Negative

None

Strength:

Stronger

Weaker

estimated r:

-1 -0.5 0 0.5 1

D

scatterplot of dispersed points tending toward increasing in vertical position as the horizontal position increases

Direction:

Positive

Negative

None

Strength:

Stronger

Weaker

estimated r:

-1 -0.5 0 0.5 1

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