A consumer advocacy group was interested in the cost of hiring a removalist and

Question

A consumer advocacy group was interested in the cost of hiring a removalist and how that related to the distance from source to destination. A random sample of removalist jobs was obtained, with the costs and Plot of the data 3 Numeric summary of the data: n 32 y3866874.50 y= 1207.94 Sy 462.9 Sy 6642480 F 642.97 350.7 3812895 SSReg 3921618 SSErr = 2720862 Diagnostic plots of the residuals Some Minitab output Regression Analysis: Cost versus Distance The regression equation is Cost556 1.01 Distance Predictor Coef SE Coes Constant 555.9 Distance 1.0142 0.15420.000 112.6 4.94 0.000 S 301. 157 R-Sq 59.0% R-Sq(adj) -57.7% - -

Explanation / Answer

A) b^=1.0142

Se(b^)=0.1542

Df= n-2=30

t=1.96 (approximation in z)

(1.0142-1.96*0.1542,1.0142+1.96*0.1542)

=(0.712,1.316)

B)since 1.5 is not present in confdconfi interval.

We reject the null hypothesis that true rate is 1.5

C)

Intercept is y^ when x=0

Hence 555.9 can be considered as truck loading unloading for removalist jon

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