
Scatterplots
One axis represents each variable, data plotted as points

Response /Dependent variable
measures or records the outcome (yaxis)

Explanatory /Independent variable
explains changes in the response variable (xaxis)

Form
linear, nonlinear, no relationship, curved, clustered

Direction
positive, negative, no direction

Strength
how much scatter around the main form

Outliers
deviations from the main pattern

Correlation
 Correlation coefficient (r)  a measure of the direction and strength of a relationship. It is
 calculated using the mean and the standard deviation of both the x and y variables.
 r ranges from 1 to +1
 When variability in one or both variables decreases, the correlation coefficient gets
 stronger (closer to +1 or −1).
 Correlations are calculated using means and standard deviations and thus are NOT
 resistant to outliers.

