QUESTION 12 A college professor wants to estimate the mean age of all of her students. In a random sample of 24 students, the mean age is found to be 21.5 years. The study was done the previous year and produced a standard deiation of 1.2 years, where the population was normally distributed. Find the standard error E and construct a 95% confidence interval of the population mean age standard error, E: 0.2449 CI: ( 20.3 22.7