Find the sample proportions and z test statistic

Reference no: EM13241187

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 Î± = .01, did the yellow fire trucks have a significantly lower accident rate? (a) State the hypotheses. (b) State the decision 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, to whom, and why? (g) Is the normality assumption fulfilled? Explain.

Reference no: EM13241187

Questions Cloud

Compare the aztec and inca societies : Compare the Aztec and Inca societies with those of the Pacific islands. What were the similarities? What were the significant differences?

An engineer in an automotive factory wishes to know what : An engineer in an automotive factory wishes to know what the tire pressure is on all cars leaving the factory. She measures the tire pressure on a sample of 10 randomly selected cars as they are about to leave the plant, in psi.

How do you find the normal distribution when the mean is 50 : How do you find the normal distribution when the mean is 50 witha standard deviation between scores of 32 and 47?

Find the probability for question : What is the probability that the male sample will have at most three more days of absences than the female sample?

Find the sample proportions and z test statistic : 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 ..

Calculating the effectiveness of an educational intervention : Calculating the effectiveness of an educational intervention using a pretest-posttest design. I plan to run an ANCOVA on the scores with the pretest as the covariate. The six subcatagories on the test give the raw score of correct answers out of the ..

Determine the null hypothesis : Test at the 5% level of significance whether the true mean time it takes for luggage to reach the travelers is less than 17 minutes. Determine the null hypothesis.

How can find the number of students who made a b : If I know the T-score for those who made an A on a test is 60, the z-score for those that made a B is .5, the number of students total is 200,

Find the childs speed at the lowest point : A 43.0-kg child swings in a swing supported by two chains, each 2.92 m long. The tension in each chain at the lowest point is 346 N. Find the child's speed at the lowest point

User Account

All Pages