The following is the upper and lower bounds of a measurement of size from a sample from a production process.
LB = 28.75 UB = 81.25 Sample Mean is 65, Variance is 225. Distribution is normal. Please excuse the cross post.. I need to determine the level of confidence associated with those intervals? I know I need to use the following formula. Sample Mean +- Z (SD/SQRT(N)) I know the mean and SD. Problem is I don't know the sample size n. How do I get it? Any help greatly appreciated... . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
