Cost of Pizzas A pizza shop owner wishes to find the 95% confidence interval of the true mean cost of a large plain pizza. How large should the sample be if she wishes to be accurate to within $0.11?...

Extracted text: Cost of Pizzas A pizza shop owner wishes to find the 95% confidence interval of the true mean cost of a large plain pizza. How large should the sample be if she wishes to be accurate to within $0.11? A previous study showed that the standard deviation of the price was $0.15. Round your final answer up to the next whole number. The owner needs at least a sample of pizzas.