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A random sample of 200 automobile owners in a region shows that an automobile is driven...
A random sample of 200 automobile owners in a region shows that an automobile is driven on average 22 comma 500 kilometers per year with a standard deviation of 3700 kilometers. Assume the distribution of measurements to be approximately normal. (a) Construct a 90% confidence interval for the average number of kilometers an automobile is driven annually in the region. (b) What can we assert with 90% confidence about the possible size of our error if we estimate the average number of kilometers driven by car owners in the region to be 22 comma 500 kilometers per year?
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