Determine the sample size needed for each of the situations shown below
a. N= 3,900 variance = 400 1.96 variane sample mean =75
b. N= 7,800 variance = 400 1.96 variance sample mean = 75
c. N= 7,000,000 variance = 400 1.96 variance sample mean = 75
d. compare and comment on your answers to part a. through c.





