1)For n = 49, find the 90% confidence interval for x bar = 85 and ó = 2. Do not round.
2)A purchasing agent for a national chain of seafood restaurants wants to estimate the mean weight of shrimp in a large catch. How many shrimp should be sampled from the catch to be 95% confident that the sample mean will be off from the actual mean weight by no more than 1.4 grams. Assume that ó = 4 grams.
3)Find the 99% confidence interval for a sample size of 25, x bar = 150, and s = 3. Round your final answer to two decimal places.