Some traffic experts believe that the major cause of highway collisions is the differing speeds of cars. That is, when some cars are driven slowly while others are driven at speeds well in excess of the speed limit, cars tend to congregate in bunches, increasing the probability of accidents. Thus, the greater the variation in speeds, the greater will be the number of collisions that occur. Suppose that one expert believes that when the variance exceeds 18 mph2, the number of accidents will be unacceptably high. A random sample of the speeds of 245 cars on a highway with one of the highest accident rates in the country is taken. Can we conclude at the 10% significance level that the variance in speeds exceeds 18 mph2?
Answer to relevant QuestionsThe job placement service at a university observed the not unexpected result of the variance in marks and work experience of the university’s graduates: Some graduates received numerous offers whereas others received far ...a. Calculate the p-value of the test of the following hypotheses given that p̂ = .63 and n = 100:H0: p = .60H1: p > .60b. Repeat part (a) with n = 200. c. Repeat part (a) with n = 400.d. Describe the effect on the p-value ...In Chapter 6, we discussed how an understanding of probability allows one to properly interpret the results of medical screening tests. The use of Bayes’s Law requires a set of prior probabilities, which are based on ...Refer to Exercise 12.112. Do the data allow us to conclude that more than 90% of all business students would rate it as at least adequate?Among Democratic and Republican party supporters only can we conclude that there are less Republican party supporters than Democratic party supporters (PARTYID3: 1 = Democrat, 2 = Independent, 3 = Republican, 7 = other)?
Post your question