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Correlation Coefficient (r) r > 0.8 Strong positive linear relationship 0.8 < r < 0.5 Moderate positive linear relationship 0.5 < r < 0.2 Weak positive.

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Presentation on theme: "Correlation Coefficient (r) r > 0.8 Strong positive linear relationship 0.8 < r < 0.5 Moderate positive linear relationship 0.5 < r < 0.2 Weak positive."— Presentation transcript:

1 Correlation Coefficient (r) r > 0.8 Strong positive linear relationship 0.8 < r < 0.5 Moderate positive linear relationship 0.5 < r < 0.2 Weak positive linear relationship

2 Correlation Coefficient 0.2 < r < -0.2 No linear relationship -0.2 < r < -0.5 Weak negative linear relationship -0.5 < r < -0.7 Moderate negative linear relationship -0.7 < r < -1.0 Strong negative linear relationship

3 Correlation Coefficient Using calculator Stat menu Enter data in list Calc Reg X r =

4 Correlation Coefficient x y x y

5 r = r =

6 Question Question 1, page 580

7 Product Moment Correlation Coefficient r = S xy /S x S y S xy is called the covarience of x and y S x is the standard deviation of x S y is the standard deviation of y

8

9 Line of best fit The “by eye” method Using the locus of means Method of least squares (linreg- calculator

10 Finding the line of best fit x y


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