A statistics practitioner would like to estimate a population mean to within 50 units with 99% confidence given that the population standard deviation is 250.
a) What sample size should be used.
b) Repeat part (a) with a standard deviation of 50.
c) Repeat part (a) using a 95% confidence level.
d) Repeat part (a) when we wish to estimate the population mean to within 10 units.