Question: 2. A time study was conducted for a job that has a mean of 21 minutes and a standard deviation of 2.5 minutes. If we

2. A time study was conducted for a job that has a mean of 21 minutes and a standard deviation of 2.5 minutes. If we require that our estimate of the Observed Time be within 0.4 minutes with 90% accuracy, how many observations are required?

3. In an analysis designed to estimate how often call center operators were idle, 90 observations were made. Operators were idle 37 times. What is the estimated percentage of idle time?

2. A time study was conducted for a job that has

Z- Confidence value 90% 1.65 95% 1.96 95.5% 2.00 98% 2.33 99% 2.58

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