In a time study, what is the required sample size to be 95% confident that the observed average time is within ± 2% of the actual value, if the process has a standard deviation of 1 minute and mean of 50 minutes?
What will be an ideal response?
n = (zs/h )2 = [(1.96 × 1 ) / (0.02 × 50 )]2 = 3.8416 = 4 samples
Business
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