The management of a major dairy wanted to determine the average ounces of milk consumed per resident in California. Past trends indicated that the variation (variance, square of standard deviation) in milk consumption was 24 ounces. A 95% confidence level is required and the error is not to exceed +/- 0.8 ounces.

1) What sample size would you recommend?

2) 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.