For some reason the quality of production decreases as the y

For some reason the quality of production decreases as the year progresses at a light bulb manufacturing plant. The following data represent the percentage of defective light bulbs produced at a light bulb manufacturing plant in the corresponding month of the year:

Use the equation of the least squares line to predict in which month the percentage of defective light bulbs would be 1.83%.

Solution

The equation is

y=1.0473+0.1841*x

approximately the percentage of defective light bublbs would be 1.83% in the 4.5 month or 5th month.