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3 The following data is available for the number of materials purchased and the total cost. Number of units purchased 1 2 3 4 Total

3 The following data is available for the number of materials purchased and the total cost. Number of units purchased 1 2 3 4 Total cost 10 20 30 40 Without using the formula, state the correlation coefficient between the two variables. A. -1 B. +1 C. -0.75 D. +0.75

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