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Scatter plot
a collection of set data points, one data point per person or object.
If there is a clear relationship, quantities are said to be ...
correlated
Correlation is used to determine...
if there is a relationship between two variables and, if so, the strength and directions of that relationship
A line that fits the data points in a scatter plot is called a ...
regression line
Correlation Coefficient
A measure that is used to describe the strength and direction of a relationship between variables whose data points lie on or near a line
Correlation coefficient is designated by
r
Variables are _________ if they tend to increase or decrease together
positively correlated
Variables are negatively correlated if
Perfect positive correlation
all points in the scatter plot lie precisely on the regression line that rises from the left to the right
Perfect negative correlation
all points in the scatter plot lie precisely on the regression line that falls from the left to the right
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