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 for each Z score.
A population distribution is known to have standard deviation 20.
Determine the p value of a test of the hypothesis that the population
mean is equal to 50, if the average of a sample of 64 observations
is a) 52.5 , b) 55.0 , c) 57.5
1 answer