Problem

Linear Regression Use linear regression to find the equation for the linear function that best fits this data. Round both numbers to two decimal places. Write your final answer in a form of an equation $y=m x+b$ \begin{tabular}{|r|r|r|r|r|r|r|} \hline$x$ & 1 & 2 & 3 & 4 & 5 & 6 \\ \hline$y$ & 79 & 100 & 110 & 127 & 149 & 165 \\ \hline \end{tabular}

Solution

Step 1 :We are given the following data points: \(x = [1, 2, 3, 4, 5, 6]\) and \(y = [79, 100, 110, 127, 149, 165]\).

Step 2 :We need to find the equation of the line that best fits these data points. The equation of a line is given by \(y = mx + b\), where \(m\) is the slope and \(b\) is the y-intercept.

Step 3 :We can use the formulas for the slope (\(m\)) and y-intercept (\(b\)) in a linear regression, which are given by: \[m = \frac{n(\sum xy) - (\sum x)(\sum y)}{n(\sum x^2) - (\sum x)^2}\] and \[b = \frac{(\sum y) - m(\sum x)}{n}\]

Step 4 :First, we calculate the necessary sums from the given data: \(n = 6\), \(\sum x = 21\), \(\sum y = 730\), \(\sum xy = 2852\), and \(\sum x^2 = 91\).

Step 5 :Substituting these values into the formulas, we find \(m = 16.97142857142857\) and \(b = 62.26666666666667\).

Step 6 :Rounding these values to two decimal places, we get \(m = 16.97\) and \(b = 62.27\).

Step 7 :\(\boxed{\text{Final Answer: The equation for the linear function that best fits the data is } y = 16.97x + 62.27}\)

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