Question: a) An ice cream producer has a machine that fills one-gallon cartons of ice cream. The producer wants to estimate the mean volume of ice cream the machine is putting in the cartons within 0.25 ounce. Determine the minimum sample size required to construct a 90% confidence interval for the population mean. Assume s = 0.85 ounce.

b) Repeat b) using an error of tolerance of 0.15 ounce instead of 0.25 ounce.

c) Which error tolerance requires a larger sample size?