7.2 a population has a mean of ? = 80 and a standard deviation of ? = 10.
a. if you select a random sample of n = 4 scores from this population, how much error would you expect between the sample mean and the population mean?
b. if you select a random sample of n = 25 scores from this population, how much error would you expect between the sample mean and the population mean?
c. how much error would you expect for a sample of n = 100 scores?