Question: 3. (a) We measure the diameters for a random sample of 25 oak trees in a neighbourhood. Diameters of oak trees in the neighbourhood follow

3. (a) We measure the diameters for a random sample of

3. (a) We measure the diameters for a random sample of 25 oak trees in a neighbourhood. Diameters of oak trees in the neighbourhood follow a normal distribution with standard deviation 8.25 cm. A confidence interval for the true mean diameter of all oak trees in the neighbourhood is calculated to be (36.191, 42.969). What is the confidence level of this interval? (b) We measure the service times for random sample of 36 customers at a bank. The standard deviation of service times for all customers is known to be 2.4 minutes. A confidence interval for the true mean service time is calculated to be (3.516, 5.084). What is the confidence level of this interval

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