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An analyst is weighing out 1 gram samples and has determined that the sampling standard deviation...

An analyst is weighing out 1 gram samples and has determined that the sampling standard deviation for the process is 6%. Using the following table for confidence intervals, how many 1 gram samples must be analyzed to give 90% confidence that the mean is known to within ±3%? Z=1.96

A. 13                                                    B. 14                                     C. 15                                     D. 16

Please provide detailed solution for better understanding. Thank you.

Math   Statistics-And-Probability   
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