Statistics help - 95% Confidence Interval

Given the same sample statistics, which level of confidence would produce the widest(longest) confidence interval? A. 90% B. 95% C. 98% D. 99%

Hi can you please help me I have a few questions but this one is important The quoted mean number of milligrams of sodium in a certain brand of low-salt microwave frozen dinners is 670mg. A random sample of 46 dinners is selected and found to have a mean of 685mg and standard deviation is 29mg....

39 nuts are gathered. They have an average size of 3.34 cent and a standard deviation of .45 cent. Find the 95% confidence interval for the mean size of all the nuts

A sample of the math test scores of 35 fourth-graders has a mean of 82 with a standard deviation of 15. Find the 95% confidence interval of the mean math test cores of all fourth-graders. Find the 99% confidence interval of th mean math test scores of all fourth-graders Which interval is...