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General Statistics
Chapter 3
Regression and Correlation
Workshop 3a - Correlation

Calculate the Correlation Coefficient of the following pairs of data: Example
Table 3.3 Correlation Coefficient Computational Matrix
x y xy x2 y2
10 12      
15 9      
20 7      
25 6      
30 4      

(a) Compute r from formula:                    (b) r2 = 

(c) Draw a scattered plot of the data and

(d) State the degree of correlation between the variables.

(e) Compare results to General Statistics (Simple Linear Regression, r from r2 )

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