Question 1: What is a regression equation? What are the interpretations of the numbers 55.9 and 0.22 in the regression equation?
A regression equation predicts one continuous variable from another. The line shows the estimated mean ear size for given age. The line has slope 0.22, i.e. mean ear size increases by 0.22 mm for each year of age. When age is zero, the line would cross the vertical axis at 55.9.
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