How Many Cycles Should Be Used in a Time Study

question 19

Multiple Choice

How many cycles should be used in a time study in order to be 95% confident that the time-study average job cycle time is within 5% of the true average job cycle time.Assume that the average job cycle time was 2.67 minutes and the standard deviation of the sample was 0.72 minutes.

• A)36 cycles
• B)72 cycles
• C)98 cycles
• D)112 cycles

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Definitions:

Expected Returns

The anticipated return on an investment, estimating the average of probability-weighted returns for a given asset.

Probability Distribution

A probability distribution is a mathematical function that provides the probabilities of occurrence of different possible outcomes in an experiment.

Variability

The extent to which data points in a set differ from each other and from the mean of the set; a measure of dispersion or volatility.

Standard Deviation

A measure of the dispersion or variability of a set of data points around the mean, commonly used in finance to represent the volatility or risk associated with a particular investment.