=+1. The flow rate y (m3

/min) in a device used for airquality measurement depends on the pressure drop x (in. of water) across the device’s filter. Suppose that for x values between 5 and 20, the two variables are related according to the simple linear regression model with true regression line y 5 2.12 1 .095x.

a. What is the expected (i.e., true average) change in flow rate associated with a 1-in. increase in pressure drop? Explain.