Use the following information for Question 68: The Chicago Police Department tes

Question

Use the following information for Question 68: The Chicago Police Department tests 15 cars, Chevrolet (Impala), Dodge (Intrepid) and Ford (Crown Victoria). Each car is driven 30,000 miles and the operating costs per mile are calculated. The operating costs, in cents per mile, are: Chevrolet 14.0 13.8 Dodge 14.2 14.6 14.0 14.5 Ford 14.6 14.8 14.5 14.2 13.7 MINITAB calculated the following analysis for an ANOVA, one-way (unstacked) One-way Analysis of Variance Analysis of Variance Source DF Factor Error Total MS 2 2.338 1.169 7.64 0.007 12 1.836 4.173 0.153 14 Individual 95% CI's For Mean Based on Pooled StDev Level Chevrolet Dodge Ford StDev 0.418 ) 0.275 0.259 Mean 5 13.600 4 14.325 6 14.450 13.60 14.00 14.40 68. At a 0.05 level of significance, The decision about the mean operating costs of the cars is (A) Reject Ho. Data provided sufficient evidence to support that at least one of these cars has a (B) Reject Ho. Data did not provide sufficient evidence to support that at least one of these cars has a (C) Do not reject Ho (fail to reject Ho). Data provided sufficient evidence to support that at least one (D)Do not reject Ho (fail to reject Ho). Data did not provide sufficient evidence to support that at (A) None of these different mean operating cost from the others. different mean operating cost from the others. of these cars has a different mean operating cost from the others. least one of these cars has a different mean operating cost from the others.

Explanation / Answer

H0: mu1 =mu2 = m3   Vs H1: Atleast one is different

Pvalue = 0.007

Alpha = 0.05

Pvalue < Alpha

Reject H0

Data provide suffecient evidence to support that atleast one of these cars has a different mean operating cost from the others.

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