correlation coefficient
descriptive statistic that summarizes and describes the important characteristics of a relationship: type + strength
scatterplot
a graph that shows the location of each data point formed by a pair of X-Y scores
outlier
a data point that is relatively far from the majority of data points in the scatterplot. An extreme score which may bias your computations
type of relationship
- the overall direction in which the Y scores change as the X scores change
linear relationship
- forms a pattern that follows one straight line
- as X scores increase, Y scores tend to change in only one direction (increase if positive, decrease if negative)
regression line
the line on a graph that summarizes a relationship, by passing through the center of a scatterplot
nonlinear/curvilinear relationship
As the X scores change, the Y scores do not tend to only increase or only decrease - at some point the Y scores change their direction
strength of relationship
the extent to which one value of Y is consistently paired with one and only one value of X
Pearson correlation coefficient (r)
describes the type (either positive and negative) and the strength of the linear relationship between two interval and/or ratio variables
Spearman rank-order correlation coefficient (rs)
describes the linear relationship between two variables when measured by ranked (ordinal) scores
correlation coefficient
descriptive statistic that summarizes and describes the important characteristics of a relationship: type + strength
scatterplot
a graph that shows the location of each data point formed by a pair of X-Y scores
outlier
a data point that is relatively far from the majority of data points in the scatterplot. An extreme score which may bias your computations
type of relationship
- the overall direction in which the Y scores change as the X scores change
linear relationship
- forms a pattern that follows one straight line
- as X scores increase, Y scores tend to change in only one direction (increase if positive, decrease if negative)
regression line
the line on a graph that summarizes a relationship, by passing through the center of a scatterplot
nonlinear/curvilinear relationship
As the X scores change, the Y scores do not tend to only increase or only decrease - at some point the Y scores change their direction
strength of relationship
the extent to which one value of Y is consistently paired with one and only one value of X
Pearson correlation coefficient (r)
describes the type (either positive and negative) and the strength of the linear relationship between two interval and/or ratio variables
Spearman rank-order correlation coefficient (rs)
describes the linear relationship between two variables when measured by ranked (ordinal) scores