It is time-consuming and costly to have trucks stop in order to be weighed on a static scale. The Minnesota Department of Transportation considered using a scale that would weigh trucks while they were moving. Here is data for a sample of trucks that were weighed in motion and also on a static scale (1000s of lbs).

a. Determine the sample correlation coefficient r.
b. Test H₀: ρ = .85 versus H_a: ρ > .85 at level .05.
c. How successful do you think the simple linear regression model would be in predicting static weight from in-motion weight? Explain.

Transcribed Image Text:

Truck In-motion Static Truck In-motion Static 1 26.0 27.9 6 36.2 34.5 2 29.9 29.1 7 25.1 3 39.5 38.0 8 31.0 27.8 29.6 4 25.1 27.0 9 35.6 33.1 5 31.6 30.3 10 40.2 35.5