The U.S. government's "Cash for Clunkers" program encouraged individuals to trade in their old gas-guzzlers for new, more efficient vehicles. At α = .05, do the data below sup- port the hypothesis that the gain in mpg was more than 5 mpg? The null hypothesis is H0 : µd ≤ 5 mpg.
Answer to relevant QuestionsThe coach told the high school swim team that times in the 200-yard individual medley in the Division I-AA Swim Championships typically are more than 1/2 second faster than their seed times going into the meet. At α = .05, ...Calculate the test statistic and p-value for a test of equal population proportions. What is your conclusion? a. Left-tailed test, α = .10, x1 = 28, n1 = 336, x2 = 14, n2 = 112 b. Right-tailed test, α = .05, x1 = 276, n1 = ...Is the water on your airline fight safe to drink? It is not feasible to analyze the water on every fight, so sampling is necessary. The Environmental Protection Agency (EPA) found bacterial contamination in water samples ...A survey of 100 cigarette smokers showed that 71 were loyal to one brand, compared to 122 of 200 toothpaste users. Construct a 90 percent confidence interval for the difference in proportions. Do a larger proportion of college students than young children eat cereal? Researchers surveyed both age groups to find the answer. The results are shown in the table below. (a) State the hypotheses used to answer the ...
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