Ex. 10,11

idililly households in the city. 10. Does (a) or (b) yield a more precise estimator of u? grow inspine (a) The sample mean of a sample of size n from a population with mean u and variance o 2 (b) The sample mean of a sample of size 3n from a population with mean u and variance 202 (c) How large would the sample in (b) have to be in order to match the precision of the estimator in (a)? 11. Repeat Prob. 10 when (a) and (b) are as follows: (a) The sample mean of a sample of size n from a population with mean u and standard deviation o (b) The sample mean of a sample of size 3n from a population with mean u and standard deviation 30