Find the 95 percent range for the sample mean, assuming that each sample is from a normal

Question

population.

a. ì = 200, ó = 12, n = 36
b. ì = 1,000, ó = 15, n = 9
c. ì = 50, ó = 1, n = 25

Answer 1

95% = mean ± 1.96 SEm

SEm = SD/√n