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\(\pi\)
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\(\frac{a}{b}\)
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A shop owner records the amount spent on advertising (\(X\), in hundreds of dollars) and the resulting sales revenue (\(Y\), in thousands of dollars) for 6 consecutive months.
\(X\)
1
2
3
4
5
6
\(Y\)
10
18
25
40
55
62
Plot these points on a scatter diagram.
Calculate Pearson's correlation coefficient, \(r\), with a calculator.
Describe the correlation between variable \(X\) and variable \(Y\) in terms of direction and strength.
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