Basic Marketing Research 7th Edition by Gilbert Churchill,Tom Brown,Tracy Suter

Exercise 4

The management of a major dairy wanted to determine the average ounces of milk consumed per resident in the state of Montana. Past trends indicated that the variation fill milk consumption(s) was four ounces. A 95% confidence level is required, and the error -1 is not to exceed +/-12 ounces.
a. What sample size would you recommend Show your calculations.
b. Management wanted to double the level of precision and increase the level of confidence to 99%. What sample size would you recommend Show your calculations. Comment on your results.