If you select a random sample of n 45 scores from a populat

If you select a random sample of n = 45 scores from a population with ?= 55 and ? = 8, how much error would you expect, on average, between the sample mean and the population mean?

Solution

standard error of mean = standard deviation / sqrt(size of sample)

= s/sqrt(n)

= 8/sqrt(45)

= (8*sqrt(5))/15 or 1.1926