A random sample of 100 automobile owners in the state of New Jersey shows that an automobile is driven on average 23,500 kilometers per year with a standard deviation of 3,900 kilometers. Assume the distribution of measurements to be approximately normal. (a) Construct a 99% two-sided confidence interval for the average number of kilometers an automobile is driven annually in New Jersey. (b) Construct a 90% two-sided confidence interval on σ, the standard deviation of kilometers an automobile is driven annually in New Jersey