Question 2: What is a regression line?
'Regression' is the name given to a group of procedures used to predict one variable, called the outcome, from another variable, called the predictor. A regression line is the graphical representation of the best prediction of the outcome variable (vocabulary test score) from the predictor (age).
This is a straight line, because the relationship which has been imposed on the data is of the form:
vocabulary test score = intercept + slope × age.
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