How Many Cycles Should Be Used in a Time Study

question 24

Multiple Choice

How many cycles should be used in a time study in order to be 98% confident that the time-study average job cycle time is within 4% of the true average job cycle time? Assume that the average job cycle time is 4.25 minutes and the standard deviation of the sample is 0.65 minutes.

• A)55 cycles
• B)70 cycles
• C)80 cycles
• D)95 cycles

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