Identify each of the statements as true or false. Use T to indicate true and F t
ID: 3056397 • Letter: I
Question
Identify each of the statements as true or false. Use T to indicate true and F to indicate false.
1)It is usually unwise to use the regression model to predict for values beyond those in the data set (extrapolation).
2)A negative value for the correlation indicates that the two variables are unassociated.
3)If r is extremely close to 1, one may infer causation between the explanatory variable and the response variable.
4)The correlation coefficient r is not affected by outliers.
5)Changing the units of measurement of x or y does not affect the correlation coefficient
6)r has the same sign (positive or negative) as the slope of the regression line.
Explanation / Answer
1) )It is usually unwise to use the regression model to predict for values beyond those in the data set (extrapolation).--T
2)2)A negative value for the correlation indicates that the two variables are unassociated --F
3) The correlation coefficient r is not affected by outliers ---- F
4) Changing the units of measurement of x or y does not affect the correlation coefficient --T
5) r has the same sign (positive or negative) as the slope of the regression line. --T