Linear Correlations

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True or False: If the slope of the least square line is positive then the value or r will also be positive.

• True

• False

Tags

CCSS.8.EE.B.5

True or False: If the correlation coefficient (r) is negative, then the coefficient of determination (r^2) will be positive.

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• False

If r = 0.9, then the 90% of variation in the response variable that is explained by the explained by the explanatory variable in the least-squares regression line.

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True or False: The least-squares regression line will always pass throught the ordered-pair (mean of x, mean of y).

• True

• False

Tags

CCSS.8.EE.B.6

CCSS.8.F.A.3

True or False: It is risky to use the least-squares regression equation to make a prediction that is outside the range of values in the observed values.

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True or False: The correlation coefficient (r) is only used for linear regressions.

• True

• False