Z = (score-mean)/SEm
SEm = SD/√n
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability between the two Z scores.
The heights of kindergarten children are normally distributed with a mean of 39.5 inches and a standard
deviation of 3.8 inches. In a kindergarten class of 23 children, what is the probability that their mean
height is between 38.1 and 41.2 inches?
1 answer
1 answer