Question 33 5 Points The IE Dept. is interested in the mean age of a certain population. A random sample of 10 individuals drawn from the population has a mean of 27. Assuming that the population is approximately normally distributed with variance 20, can we conclude that the mean is different from 30 years ? (a=0.10) . What is the critical region? A +/- 1.33 B +/- 1.0 C + /- 1.96 D +/- 1.645 Question 34 5 Points The IE Dept. is interested in the mean age of a certain population. A random sample of 10 individuals drawn from the population has a mean of 27. Assuming that the population is approximately normally distributed with variance 20, can we conclude that the mean is different from 30 years ? (a=0.10) . What is the computed test statistic A T =-0.47 B T = -2.12 C Z =-0.47 D Z =-2.12