IDNLearn.com: Your one-stop platform for getting reliable answers to any question. Get accurate and detailed answers to your questions from our dedicated community members who are always ready to help.

Find the three intervals with 90%, 95%, or 99% confidence level for the mean training time. Compare with estimates assuming σ = S. [4] The lengths of steel pipes produced by BEST Steel Inc. Are normally distributed with standard deviation 1. 8 mm? How large a sample is needed to find the 99% confidence interval for the pipe length with margin of error 0. 50 mm?