Differentiate. 
Definitions:
Independent Variable
Variables in a study that are presumed to influence or determine the dependent variable, essentially the cause in a cause-and-effect relationship.
Least Squares Estimate
A method of estimating the parameters of a linear regression line by minimizing the sum of the squares of the differences between the observed and predicted values.
Y-intercept
The point where a line crosses the Y-axis of a graph, indicating the value of the dependent variable when the independent variable is zero.
Independent Variable
A variable in an experiment or study that is manipulated to observe its effect on a dependent variable.
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