In 2005 the average car in the United States was
In 2005, the average car in the United States was driven 12.4 thousand miles, as reported by the Federal Highway Administration in Highway Statistics.
On the WeissStats CD, we provide last year's distance driven, in thousands of miles, by each of 500 randomly selected cars. Use the technology of your choice to do the following.
a. Obtain a normal probability plot and histogram of the data.
b. Based on your results from part (a), can you reasonably apply the one-mean t-test to the data? Explain your reasoning.
c. At the 5% significance level, do the data provide sufficient evidence to conclude that the mean distance driven last year differs from that in 2005?
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