Americans eat out very frequently; the average American adult buys a meal or snack from a restaurant 5.8 times a week (The United States Healthful Food Council, December 5, 2015). Assume the standard deviation for the number of meals or snacks American adults buy from restaurants per week is 1.5. Suppose you would like to conduct a survey to develop a 95% confidence interval estimate of the number of meals or snacks American adults buy from restaurants per week. A margin of error of 0.5 is desired. How large a sample should be used for the current survey?