The average age for licensed drivers in a county is / = 41.6, o = 12, and the distribution is approximately normal. A county police officer was interested in whether the average age of drivers receiving speeding tickets differed from the average age of the driving population. She obtained a sample of N = 24 drivers receiving speeding tickets. The average age for this sample was M = 32.6. Calculate the 95% confidence interval for this sample mean. Assume the z cutoff is +/- 1.96