Question 1

How many observations would be necessary for a time studies analyst to be 99% confident that the average time is within ± .1 minutes of the true value,if the average time is 10.5 minutes and the standard deviation is 3 minutes?

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Question 2

A work sampling study requires an acceptable error level of ± 10 percent and 95 percent confidence.a.What is the required sample size if the sample proportion busy is as large as 50 percent? b.What is the required sample size if the sample proportion busy is estimated to be about 20 percent?

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Question 3

In a time study,what is the required sample size to be 95% confident that the observed average time is within ± 2% of the actual value,if the process has a standard deviation of 1 minute and mean of 50 minutes?

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Question 4

An initial analysis of a laboratory activity resulted in the first table below.After this analysis,the managers determined that their element descriptions were not as accurate as they should have been-they had left out an element,underestimated a distance,and understated the need for accuracy.They revised the table of element data,which appears in the second table.
   Calculate the total standard minutes for the original activity "pouring tube specimen." Calculate the total standard minutes for the revised activity "pouring tube specimen." What is the increase,in seconds,from the first version to the second? (Round calculations to four decimal places. )

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Question 5

A brake system installer in an auto factory has an actual average time of 10 minutes on her task.The performance rating of the worker timed was estimated at 110%.Practice in this department is to allow 9% for allowances.
a.Find the normal time for the operation.
b.Compute the standard time for the operation.

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Question 6

A Methods and Measurements Analyst needs to develop a time standard for a certain task.The task involves use of a ruler,square,and portable electric saw to mark and cut the "notch" in a rafter (a standard carpentry task of home construction).In a preliminary study,he observed one of his workers performing this task five times.The observations were made in an air-conditioned,well-lit training facility,at ground level,with all tools and equipment clean and readily available.
  a.What is the actual average time for this task?
b.What is the normal time for this task if the employee worked at a 20% faster pace than is typical for adequately trained workers?
c.What is standard time for this task if allowances sum to 14%?
d.If the analyst then thought more carefully about his experiment and decided that the allowances needed to be increased to match the real (outside,not air-conditioned)work environment,and that the proper allowance was not 14% but 20%,what is the revised standard time?

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Question 7

Suppose that a time study analyst takes a sample of size 60 observations.The process mean is 100 seconds,and the standard deviation is 3 seconds.If the max error can be no more than ± 1 second,how confident can the analyst be in the results?

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Question 8

An operation in a television factory has an average observed time of 6 minutes.The performance rating of the worker timed was estimated at 90%.Practice in this department is to provide 8% for allowances.
a.Find the normal time for the operation.
b.Compute the standard time for the operation.
c.Recompute the standard time if an additional fatigue allowance of 8% is factored in.

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Question 9

What are three disadvantages of work sampling?

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Question 10

Ethical work environment decisions by managers may be guided by which of the following?

Accepted Answer

Ethical work environment decisions by managers may be influenced by various stakeholders, including state agencies that enforce regulations, trade associations that provide guidelines and codes of conduct, insurers that assess risks and liabilities, and employees who may have different perspectives and values. A comprehensive approach that considers input from multiple sources can help managers make informed and responsible decisions that align with ethical values and principles.

Question 11

A manufacturing plant is trying to determine standard production per day for an incentive program.Suppose that the incentive program will pay $1 per unit produced above standard rates.A worker is timed at an average of 280 seconds per unit,with a performance rating of 105%.The plant has an allowance factor of 13%.If the worker later produces 100 units in an 8 hour shift,how much would he receive under the incentive plan?

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Question 12

A time study of a certain service task found an average time of 15 minutes,with a standard deviation of 5 minutes.These figures were based on a sample of 100 measurements.Is the sample large enough that we are 95% confident that standard time is within ±5% of its true value?

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Question 13

In a preliminary work sample of an operation,out of 50 observations the operator was observed idle in 5 observations.What sample size is required for a work sampling study if the desired confidence level is 99% and the desired accuracy level is ± 5%?

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Question 14

A task involves positioning two metal parts with a rubber gasket sandwiched between them,inserting two bolts into predrilled holes,threading a nut onto each bolt,and tightening each bolt with a pneumatic wrench.In a preliminary study,the manager observed one of his workers performing this task five times.The observations were made in an air-conditioned,well-lit training facility,at ground level,with all tools and equipment clean and readily available.
  a.What is the average observed time for this task?
b.What is the normal time for this task if the employee worked at a 10% slower pace than is typical for adequately trained workers?
c.What is standard time for this task if allowances sum to 14%?

Accepted Answer

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Quiz 10: Human Resources,job Design,and Work Measurement