Hypothesis testing-dallas fire trucks

Reference no: EM13111731

Scenario: 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 a=.01, did the yellow fire trucks have a significantly lower accident rate?

(a) State the hypothesis.

(b) State the decision rule and sketch it.

(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.

Reference no: EM13111731

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