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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 linear relationship Correlation Coefficient (r)

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**Correlation Coefficient**

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

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**Correlation Coefficient**

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

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**Correlation Coefficient**

x 2 3 4 6 8 9 10 y 20 18 17 16 14 12 11 x 2 4 5 7 9 10 11 15 y 3 6 Correlation Coefficient

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r = r =

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Question 1, page 580 Question

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**Product Moment Correlation Coefficient**

r = Sxy/SxSy Sxy is called the covarience of x and y Sx is the standard deviation of x Sy is the standard deviation of y Product Moment Correlation Coefficient

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**Line of best fit The “by eye” method Using the locus of means**

Method of least squares (linreg- calculator Line of best fit

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**Finding the line of best fit**

x 2 4 5 7 9 10 11 15 y 3 6 Finding the line of best fit

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Correlation Correlation is used to measure strength of the relationship between two variables.

Correlation Correlation is used to measure strength of the relationship between two variables.

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