12 Suppose a certain type of fertilizer has an expected

Last updated: 11/9/2023

12 Suppose a certain type of fertilizer has an expected yield per acre of with variance o whereas the expected yield for a second type of fertilizer is with the same thy variance o Let S and S denote the sample variances of yields based on sample sizes n and no respectively of the two fertilizers Show that the pooled combined estimator 82 n 1 S n 1 S n n 2 is an unbiased estimator of o