As a follow-up to a report on gas consumption, a consumer group conducted a stud
ID: 1210955 • Letter: A
Question
As a follow-up to a report on gas consumption, a consumer group conducted a study of SUV owners to estimate the mean mileage for their vehicles. A simple random sample of 97 SUV owners was selected, and the owners were asked to report their highway mileage. The results that were summarized from the sample data were x = 19.4 mpg and S = 6.2 mpg. Based on these sample data, compute and interpret a 99% confidence interval estimate for the mean highway mileage for SUVs.
The 99% confidence interval is ___mpg to ___mpg.
Interpret this interval. Choose the correct answer below.
A. There is a 0.99 probability that the true mean highway mpg for SUVs falls in this range.
B. One can conclude with 99% confidence that the true mean highway mpg for SUVs is in this range.
C. One can conclude that the true mean highway mpg for SUVs will fall in this range 99% of the time.
D. One can conclude with 99% confidence that the sample mean highway mpg for SUVs is in this range.
Explanation / Answer
17.78 mpg to 21.02 mpg
A. There is a 0.99 probability that the true mean highway mpg for SUVs falls in this range.
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