Posted by Tracy on Friday, February 1, 2013 at 11:01pm.
If the population standard deviation is 8, how
large a sample is necessary to have a standard error
that is:
a. less than 4 points?
b. less than 2 points?
c. less than 1 point?

Math  PsyDAG, Saturday, February 2, 2013 at 11:11am
SEm = standard error of the mean
SEm = SD/√n
Insert values and solve.