data collected on two variables for each individual in a study
a two-way frequency tables, a cross-tabulation table that summarizes two variables of interest and their relationship.
A plot of all the ordered pairs of bivariate data on a coordinate axis system
perfect linear correlation
all points lie in a straight line
coefficient of linear correlation
A number from -1 to +1, denoted by r, that measures the strength and direction of a linear relationship, if any, between two sets of data.
Pearson's product moment formula
the equation used to find the value of the linear correlation coefficient, r
A cause and effect relationship in which one variable controls the changes in another variable.
a variable that is not explicitly part of a model but affects the way the variables in the model appear to be related
A mathematical approach for fitting an equation to a set of data.
least squares method
determining the line of best fit by minimizing the sum of the squares of the vertical distances between the actual y values and the predicted y values