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Least square's method of regression

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I have selected 5 athletes at different ages, but all of them looked buff, and measured their body fat. The results are listed in the table below.

Age Percent body fat
20 4
24 7
27 5
31 11
36 14

Find the regression equation for body fat to show how it varies with the age of the individual.

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This posting shows the calculation of Least square's method to find the regression equation for following data.

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