4. Let X1, - - - ,Xn be a random sample from the normal distribution with mean u and variance 02. Let T = 221:1(X1- KEV, where X\" is the sample mean. Compare nlT and (n 1)'1T as an estimator of 02 in terms of the mean and the variance. If you do not wish to do it analytically, write computer code in any platform to calculate the value for n = 10 numerically and explain how accurate you expect your answers to be