1- You're a Q/C inspector for Gallo. The for 2-liter bottles is .05 liters. A random sample of 100 bottles showed x = 1.99 liters. What is the 90%confidence interval estimate of the true mean amount in 2-liter bottles?

2- What sample size is needed to be 90% confident the mean is within 5? A pilot study suggested that the standard deviation is 45.

3- What sample size is needed to estimate p within .03 with 90% confidence?