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.

you should at least use a calculater

step-by-step explanation:

b. an equilateral triangle inscribed in a circle

step-by-step explanation:

we are given the figure of two circles having a triangle inside.

now, we know that,

"when a figure is lying inside an another figure, then the outside figure is known as circumscribed figure and the figure lying inside is referred to as the inscribed figure".

as we see that, the circles are containing the triangle completely.

thus, the circles are the circumscribed figures and the triangle is the inscribed figure.

hence, we get, 'an equilateral triangle is inscribed in a circle'.