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.

answer

explanation

the area of a circle is calculated using the formula

or

we can use any of the above formulae to calculate the required. preferably, let us use the latter since the diameter is

we substitute the diameter into the formula to get:

this is the exact value for the area of the circle.

the correct answer is a

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step-by-step explanation: