In a study of 30 customers' utility bills in which the monthly bill was the dependent variable and the number of square feet in the house is the independent variable, the resulting regression model is = 23.40 + 0.4x. Given this, the sample correlation coefficient is known to be positive.

Question

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The coefficient of the independent variable (0.4) in the regression equation is positive, indicating a positive relationship between the number of square feet in the house and the monthly bill, which implies a positive sample correlation coefficient.

In a Study of 30 Customers' Utility Bills in Which