Res 342 Week 3 Etext Answers

# Res 342 Week 3 Etext Answers

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Res 342 Week 3 Etext Answers

Week 3 E-Text

RES/342

Week 3 E-Text

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 ? .01, did the yellow fire trucks have a significantly lower accident rate? (a) State the hypotheses. H0: p1 ? p2 H1: p1 p2 (b) State the decision rule and sketch it. Reject the null hypothesis if the critical value is less than and the p-value is greater than .01.

(c) Find the sample proportions and z test statistic.

P1 4135,035 .00002962 p2 20153,348 .00013042

P x1 x2n1 n2 420135,035153,348 .00008322

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Res 342
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