Claim-two proportion z test

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Reference no: EM1315065

In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents, while the fleet of yellow fire trucks made 135,035 runs and had 4 accidents. At α = .01, did the yellow fire trucks have a significantly lower accident rate?

A. State the decision rule and sketch it

B. Find the sample proportions and test statistic.

C. Find the p-value and interpret it. 

D. If statistically significant, do you think the difference is large enough to be important?

E. Is the normality assumption fulfilled? Explain.

Reference no: EM1315065

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