# 99%

1. ### 99% one sided upper bound confidence interval for mean?

I have a random sample X1....X24 from normal distribution with mean u and variance sigma^2 = .73. If Xbar = 3.3 then what is a 99% one sided upper bound confidence interval for u?
2. ### how do i know if i should choose 90% 95% 99% ?

I'm doing this hypthesis testing, I should do a one sided t-test and i have to do it with 5% significance level. And according the answer key, i should be using 90% CI interval values from the table for the calculations. BUT i was about to choose 95%, because its 5% sign. level. So how do i know...
3. ### 99% Confident Level

I have gotten some basics from this question, but cannot think of the formula to match it. Too much information and I am lost.. PLEASE HELP!!!! At the time she was hired as a server at the Grumney Family restaurant, Beth Brigden was told, “You can average more than \$20 a day in tips.” Over...
4. ### 99% confidence interval ????????????

Hi there, im doing report on mobile phone use and i want to use some clever statistics in it. Heres the basic info: It was claimed that 65% of people wanted a regulation to ban mobile phone usage on public transport. 94 people, as far as possible selected randomly from the population, were...
5. ### Find 99% confidence interval estimate of....

Help!! Seemed to be stuck on this problem, can anyone help?? Thanks! In order to help identify baby growth pattern that are unusual we need to construct a confidence interal estimate of the mean head circumference of all babies that are two months old. A random sample of 100 babies is...