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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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