The linear regression equation is given as
Y = a + bX
where a = intercept, b = slope
Y = dependent variable = Van operating costs
X = independent variable = Miles driven
The value of the intercept and slope is found using regression analysis in excel.
In excel, go to data , data analysis , select regression
The values are entered as shown
The company's cost equation is
y = $ 0.28 x + $ 908.93
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2)
From the regression output, the value of R-square = 0.772.
The R square value indicates that 77.2% of variation in van operating costs can be explained by the variation in miles driven.
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3) Van operating cost at a volume of 16,000 miles is found using the cost equation
y = $ 0.28 16,000 + $ 908.93
y ( van operating cost at 16,000 miles) = $ 5388.93
The company should rely on this estimate because the value of R-square is 0.772 which suggests a strong association between van operating costs and miles driven.
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