Find the standard error of the estimate for the data for Example 10-12 by using the preceding formula. The equation of the regression line is \(y^{\prime}=55.57+8.13 x\).

Example 10-12

A researcher collects the following data and determines that there is a significant relationship between the age of a copy machine and its monthly maintenance cost. The regression equation is \(y^{\prime}=55.57+8.13 x\). Find the standard error of the estimate.

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Machine Age x (years) Monthly cost, y A I S 62 B 2 78 C 3 70 D 4 90 E F +6 4 93 103