8. Given two estimators X1 and X2 for a population mean, E[ X1 ] = 6, V[ X1 ] = 4, and V[ X2 ] = 5. If the true value of the population mean is 5, which of the following is(are) TRUE? 1. X1 is an...

8. Given two estimatorsX1andX2for a population mean, E[X1] = 6, V[X1] = 4, and V[X2] = 5. If the true value of the population mean is 5, which of the following is(are) TRUE?

1. X1 is an unbiased estimator.

2. X2 is less precise than X1.