SOLUTION: 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 accide
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Question 129093This question is from textbook Applied Statistics in Business and Economics
: 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 13,035 runs and had 4 accidents. At a= .01, did the yellow fire trucks have asignificantly lower accident rate? a) State the hypothesis. b)state the deicision rule and sketch it. c)find the sample proportions and z test statistic. 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, who and why? g) is the normality assumption fulfilled? Explain. This question is from textbook Applied Statistics in Business and Economics
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