Question: In Dallas some fire trucks were painted yellow (instead of red) to heighten visibility. During a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents, while the fleet of yellow trucks made 153,035 runs and had 4 accidents. At α =.01, did the yellow fire trucks have a significantly lower accident rate? (a) state the hypothesis. (b) state the decision rule and sketch it. (c) find the sample portions and z test statistics. (d) make a decision (e) find the p – value and interpret it. (f) if statistically significant, do you think the difference is large enough to be important? If so, to whom and why? (g) Is the normality assumption fulfilled? Explain.

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