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A cafe manager tracks the daily average temperature (\(X\) in \(^\circ\)C) and the number of hot chocolates sold (\(Y\)) over 6 days.
\(X\)
5
10
15
20
25
30
\(Y\)
150
120
90
60
40
25
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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