An Industrial Engineer Is Conducting a Time Study for a Work

question 89

Multiple Choice

An industrial engineer is conducting a time study for a work element.The select time is 7.5 minutes,and the sample standard deviation of the observed time is one minute.What is the appropriate sample size if the estimate is to be 3 percent of the true average time 95 percent of the time (z = 1.96) ?

• A)fewer than or equal to 70
• B)greater than 70 but fewer than or equal to 80
• C)greater than 80 but fewer than or equal to 90
• D)greater than 90

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