(Solution) - A random sample of 100 automobile owners shows that in -(2025 Original AI-Free Solution)

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A random sample of 100 automobile owners shows that, in the state of Virginia, an automobile is driven on the average 23,500 kilometers per year with a standard deviation of 3900 kilometers. Assume the distribution of measurements to be approximately normal.
(a) Construct a 99% confidence interval for the average number of kilometers an automobile is driven annually in Virginia.
(b) What can we assert with 99% confidence about the possible size of our error if we estimate the average number of kilometers driven by car owners in Virginia to be 23.500 kilometers per year?