Which of the following statistics are unbiased estimators of population parameters?
choose the correct answer below. select all that apply.
o a. sample standard deviation used to estimate a population standard deviation.
b. sample mean used to estimate a population mean.
i c. sample range used to estimate a population range.
od. sample median used to estimate a population median.
e. sample variance used to estimate a population variance.
of. sample proportion used to estimate a population proportion.

How is working backward similar to solving an equation?

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)

Me! i'm really confused the isosceles trapezoids, abcd and efgh, are similar quadrilaterals. the scale factor between the trapezoids is 2: 3, line gh = 6 centimeters, line ad = 8 centimeters, and line ab is three times the length of line dc . use complete sentences to answer the following prompts and include all of your calculations in your final answer. a. write a similarity statement for each of the four pair of corresponding sides. b. write a congruence statement for each of the four pair of corresponding angles. c. determine the perimeter for each of the isosceles trapezoids.