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A linear regression equation is computed for a sample of n = 18 pairs of X and Y scores. For the analysis of regression testing the significance of the equation, what are the df values for the F-ratio?

For the regression equation, Y = bX + a, which of the following X, Y points will be on the regression line?

Suppose the correlation between height and weight for adults is +0.80. What proportion (or percent) of the variability in weight can be explained by the relationship with height?

In the linear equation Y = 2X + 1, if X increases by 4 points, how much will Y increase?

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