Which of the following is true about regression Select each

Which of the following is true about regression? Select each that is true.

It is usually unwise to use the regression model to predict for values beyond those in the data set (extrapolation).

Even if r is extremely close to 1, one should not infer causation between the explanatory variable and the response variable with a reasonable explanation.

The correlation coefficient r has the same sign (positive or negative) as the slope of the regression line.

The correlation coefficient r is not affected by outliers.

A negative value for the correlation indicates that the two variables are not associated.

Changing the units of measurement of x or y sometimes affects the correlation coefficient r.

	A.	It is usually unwise to use the regression model to predict for values beyond those in the data set (extrapolation).
	B.	Even if r is extremely close to 1, one should not infer causation between the explanatory variable and the response variable with a reasonable explanation.
	C.	The correlation coefficient r has the same sign (positive or negative) as the slope of the regression line.
	D.	The correlation coefficient r is not affected by outliers.
	E.	A negative value for the correlation indicates that the two variables are not associated.
	F.	Changing the units of measurement of x or y sometimes affects the correlation coefficient r.

Solution

It is usually unwise to use the regression model to predict for values beyond those in the data set (extrapolation). Even if r is extremely close to 1, one should not infer causation between the explanatory variable and the response variable with a reasonable explanation. The correlation coefficient r has the same sign (positive or negative) as the slope of the regression line.