Question: For a time study, what would be the required number of readings if the analyst wanted to be 90% confident that the mean observed time

For a time study, what would be the required number of readings if the analyst wanted to be 90% confident that the mean observed time was within +/-5% of the true mean and he established the following values for an element after observing 19 cycles: 0.09, 0.08, 0.10,0.12, 0.09, 0.08, 0.09,0.12, 0.11,0.12, 0.09, 0.10,0.12, 0.10, 0.08, 0.09, 0.10,0.12, 0.09? You have a 5% desired acceptable fraction k (k = 0.05). n= (to/ku) I n=number of observations needed t = tabled value (t distribution table provided - see Appendix) o=standard deviation k=an acceptable fraction of the sample mean u = population mean

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