Question

Do the sample variances target the value of the population​ variance? In​ general, do sample variances make good estimators of population​ variances? Why or why​ not? A. The sample variances do not target the population​ variance, therefore, sample variances do not make good estimators of population variances. B. The sample variances do not target the population​ variance, therefore, sample variances make good estimators of population variances. C. The sample variances target the population​ variances, therefore, sample variances make good estimators of population variances. D. The sample variances target the population​ variance, therefore, sample variances do not make good estimators of population variances.

Answer 1

Answer: alternative C.

Step-by-step explanation: The samples chosen in surveys are often representative when taking the whole population in consideration. They have to be chosen in a random way so they are representative and there's no bias playing a role in the results. Therefore, the variance calculated on the samples are good estimations of the population variancies, since they represent the population in the best way possible.