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.

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.

gdp is the best phrase!

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.