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answerhappygod
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9. A car manufacturer advertised that its new subcompact models get 47 miles per gallon. Let u be the mean of the mileage distribution for these cars. You suspected that the mileage might be overrated and selected 16 cars of this model; the sample mean mileage was x = 45.5 and the sample standard deviation was s = 2.5. Assume that the mileage distribution is normal. At the 1% level of significance, test the claim that the mean mileage per gallon is 47 mpg or is there significant evidence that the mean mileage per gallon is less than 47 mpg. Clearly state the null hypothesis, the alternative hypothesis, the test statistic, the critical region, the sample test statistic, the decision and interpretation (significance statement)
9. A car manufacturer advertised that its new subcompact models get 47 miles per gallon. Let u be the mean of the mileage distribution for these cars. You suspected that the mileage might be overrated and selected 16 cars of this model; the sample mean mileage was x = 45.5 and the sample standard deviation was s = 2.5. Assume that the mileage distribution is normal. At the 1% level of significance, test the claim that the mean mileage per gallon is 47 mpg or is there significant evidence that the mean mileage per gallon is less than 47 mpg. Clearly state the null hypothesis, the alternative hypothesis, the test statistic, the critical region, the sample test statistic, the decision and interpretation (significance statement)
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