Arandom sample of n = 4 scores is selected from a population with mean (mu) = 80 and population standard deviation (sigma) = 20. on average, how much difference would you expect between the sample mean and the population mean? (i. e., what is the standard error of a sampling distribution composed of means taken from samples of size 4? )

10

Step-by-step explanation:

The formula used for standard error is :-

, where is population standard deviation and n is the sample size.

Given: n = 4

Then, the  difference would expected between the sample mean and the population mean will be :

Hence, the expected difference between the sample mean and the population mean = 10

560

hope this : )

trapezoid

step-by-step explanation:

first i plotted all my points on a grid graph

i made sure all of them were in the correct quadrant

then i saw it was a trapezoid or a quadrilateral