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The following pairs of values give X, Narco Medical's advertising expense during a period (in hundreds of dollars), and Y, the amount of the company's

The following pairs of values give X, Narco Medical's advertising expense during a period (in hundreds of dollars), and Y, the amount of the company's sales (in thousands of dollars) for the period: X 8 9 7 6 5 1 Y 15 11 10 11 8 5 Determine the coefficient of Correlation using the formula (NOT BY EXCEL) and interpret it.

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