In a water treatment plant, the level of turbidity, and is linearly related suspected to inches of rainwater accumulated in the month, x. The following information related to the plant available water:
Level of Turbidity 1 2 3 4 5 6
Inches of water 5.6 4.6 4.5 3.7 3.2 2.7
a. Find the equation of the line using the least squares method that best describes the data.
b. Calculate the correlation coefficient.