Least square regression line

Reference no: EM1318030

Write the letter of the response that best answers each problem.

Does the weight of a vehicle affect the gas mileage? The following random sample was collected where x = weight of a vehicle in hundreds of pounds and y = miles per gallon.

x (lb hundreds)	26	35	29	39	20
y(mpg)	22.0	16.1	18.8	15.7	23.4

1. Based on a scatter diagram, would you estimate the linear correlation coefficient to be:

(a) close to -1
(b) closer to 0 and negative
(c) close to 1
(d) closer to 0 and positive
(e) cannot determine

2. What is the equation for the least squares line?

(a) y = -32.55x + 0.448
(b) y = -32.55x - 0.448
(c) y = -32.55x + 0.448
(d) y = -0.448x + 32.55
(e) y = 0.448x - 32.55

Reference no: EM1318030

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