Let be a random sample of size n from a normal distribution , where both , are unknown. Find a minimum value of n to guarantee, with probability , that a % confidence interval for will have length no more than , where is a specified constant.

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- May 7th 2009, 07:48 AMKat-Mhelp on Confidence Interval statistical question
Let be a random sample of size n from a normal distribution , where both , are unknown. Find a minimum value of n to guarantee, with probability , that a % confidence interval for will have length no more than , where is a specified constant.