It is tedious to perform a least squares analysis without using a computer. We illustrate here a computer-based analysis using the MINITAB package. The observations on page 328 are entered in \(\mathrm{C} 1\) and \(\mathrm{C} 2\) of the worksheet.

We first obtain the scatter plot to see if a straight-line pattern is evident.

Then

produces the output

DATA 11-22.DAT x: 0 1 2 2 4 4 y: 25 20 30 40 45 50 50 60 60 56 50