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A particular Process produces parts with Standard Deviation = 6 unit. Every 3 hrs, a sample of 4 items is taken & its mean is plotted. The Standard Deviation of the mean is
Correct Answer: B
You could calculate, the SD of the sample as SD of population / sqrt(sample size) = 6 / sqrt(4) = 6/2 = 3. So answer is (B). When the question says std dev of mean, i assume that is just a typo either for "std dev of the sample" or "std dev from the mean"