Question: Has the recent drop in airplane passengers resulted in better
Has the recent drop in airplane passengers resulted in better on-time performance? Before the recent downturn one airline bragged that 92% of its flights were on time. A random sample of 165 flights completed this year reveals that 153 were on time. Can we conclude at the 5% significance level that the airline’s on-time performance has improved?
Answer to relevant QuestionsIn 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 ...The results of an annual Claimant Satisfaction Survey of policyholders who have had a claim with State Farm Insurance Company revealed a 90% satisfaction rate for claim service. To check the accuracy of this claim, a random ...GSS2012* Estimate with 95% confidence the number of American adults in 2012 who did not finish high school (DEGREE: 0 = Left high school, 1 = High school, 2 = Junior college, 3 = Bachelor’s degree, 4 = Graduatedegree).Estimate with 95% confidence the number of American adults who consider themselves political independents (PARTYID3: 1 = Democrat, 2 = Independent, 3 = Republican).Can we infer that in 2008 more Americans perceived themselves as conservative as liberal (LIBCON3: 1 = liberal, 2 = moderate 3 = conservative)?
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