Operations Management
13th Edition
ISBN: 9781259667473
Author: William J Stevenson
Publisher: McGraw-Hill Education
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Question
Chapter 7, Problem 12P
Summary Introduction
To determine: The number of work cycles required.
Introduction: The amount of the dependency on human effort by an organization in terms of achieving its goals is given by the work design. It is directly linked to the productivity of an organization where good work design helps in achieving high productivity.
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Students have asked these similar questions
A business analyst wants to validate a standard time for an existing process of a work operation. A previous study conducted have the following information:
Standard Deviation - 30 seconds; Average time – 300 seconds
With the desired confidence level of 90% and maximum error of 5%, how many observations should the business analyst conduct?
Note: Round-up your answer to whole number.
Confidence Level
Standard Deviation
80%
1.282
90%
1.645
95%
1.960
99%
2.576
An analyst has been asked to prepare an estimate of the proportion of time that a turret lathe operator spends adjusting the machine, with 90% confidence level. Based on previous experience, the analyst believes the proportion will be approximately 30%.
a. If the analyst uses sample size of 400 observations, what is the maximum error that will be associated with the estimate?
b. What sample size would the analyst need in order to have the maximum error be no more than +/- 5%?
What would typically happen if an abnormally short time was recorded when conducting a stopwatch time study?
a) It would be included in the study.
b) It would be discarded.
c) It would be factored by the performance rating.
d) Inform the supervisor of the abnormality.
Chapter 7 Solutions
Operations Management
Ch. 7.S - Prob. 1DRQCh. 7.S - Prob. 2DRQCh. 7.S - Prob. 3DRQCh. 7.S - Prob. 4DRQCh. 7.S - Prob. 5DRQCh. 7.S - Prob. 6DRQCh. 7.S - Prob. 7DRQCh. 7.S - Prob. 8DRQCh. 7.S - Prob. 9DRQCh. 7.S - Prob. 10DRQ
Ch. 7.S - Prob. 1PCh. 7.S - Prob. 2PCh. 7.S - Prob. 3PCh. 7.S - Prob. 4PCh. 7.S - Prob. 5PCh. 7.S - Prob. 6PCh. 7.S - Prob. 7PCh. 7.S - Prob. 8PCh. 7.S - Prob. 9PCh. 7.S - Prob. 10PCh. 7.S - Prob. 11PCh. 7.S - Prob. 12PCh. 7.S - Prob. 13PCh. 7.S - Prob. 14PCh. 7.S - Prob. 15PCh. 7.S - Prob. 16PCh. 7.S - Prob. 17PCh. 7.S - Prob. 18PCh. 7.S - Prob. 19PCh. 7.S - Prob. 1CQCh. 7.S - Prob. 2CQCh. 7.S - Prob. 3CQCh. 7 - Prob. 1DRQCh. 7 - What are some of the main advantage and...Ch. 7 - Prob. 3DRQCh. 7 - Prob. 4DRQCh. 7 - Prob. 5DRQCh. 7 - Prob. 6DRQCh. 7 - Prob. 7DRQCh. 7 - What are motion study principles? How are they...Ch. 7 - Prob. 9DRQCh. 7 - Prob. 10DRQCh. 7 - Prob. 11DRQCh. 7 - Prob. 12DRQCh. 7 - Prob. 13DRQCh. 7 - Prob. 14DRQCh. 7 - Prob. 15DRQCh. 7 - Prob. 16DRQCh. 7 - Prob. 17DRQCh. 7 - Prob. 18DRQCh. 7 - Prob. 19DRQCh. 7 - Prob. 1TSCh. 7 - Prob. 2TSCh. 7 - Prob. 3TSCh. 7 - Prob. 1CTECh. 7 - Prob. 2CTECh. 7 - Prob. 3CTECh. 7 - Prob. 1PCh. 7 - Prob. 2PCh. 7 - Prob. 3PCh. 7 - Given these observed times (in minutes) for four...Ch. 7 - Prob. 5PCh. 7 - Prob. 6PCh. 7 - Prob. 7PCh. 7 - Prob. 8PCh. 7 - Prob. 9PCh. 7 - Prob. 10PCh. 7 - Prob. 11PCh. 7 - Prob. 12PCh. 7 - Prob. 13PCh. 7 - An analyst made the following observations about...Ch. 7 - Prob. 15PCh. 7 - Prob. 16PCh. 7 - Prob. 17PCh. 7 - Prob. 18PCh. 7 - Prob. 19P
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- 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. Observation: 1 2 3 4 5 Task time (seconds): 82 74 80 88 76 (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 10% faster pace than is typical for adequately trained workers? (c) What is standard time for this task if allowances sum to 12%? (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…arrow_forwardDetermine the standard time of the process using the below-recorded observations. Hint: remove unusual time observationsarrow_forwardCompare stopwatch time study and work sampling.arrow_forward
- How many work cycles should be timed to estimate the average cycle time to within 2 percent ofthe sample mean with a confidence of 99 percent if a pilot study yielded these times (minutes):5.2, 5.5, 5.8, 5.3, 5.5, and 5.1? The standard deviation is .253 minutes per cycle.arrow_forwardEach year, Lord & Taylor, Ltd., sets up a giftwrapping station to assist its customers with holiday shopping. Preliminary observations of one worker at the stationproduced the following sample time (in minutes per package):3.5, 3.2, 4.1, 3.6, 3.9. Based on this small sample, what number of observations would be necessary to determine the truecycle time with a 95% confidence level and an accuracy of{5%?arrow_forwardSupervisor Kenneth Peterson wants to determinethe percent of time a machine in his area is idle. He decides touse work sampling, and his initial estimate is that the machine isidle 20% of the time. How many observations should Petersontake to be 98% confident that the results will be less than 5% fromthe true results?arrow_forward
- Supervisor Kenneth Peterson wants to detem1ine thepercentage of time a machine in his a rea is idle. He decides to usework sampling, and his initial estimate is that the machine is idle 20%of the time. How many observations should Peterson take to be 98%confident that the results will be Jess than 5% from the true results?arrow_forwardA time study in a manufacturing company of air conditioners showed the following results for the four basic elements of the production process. With the information presented in the table below: hat is the observed time for the whole operation? 00000 48.5 45.5 51.3 47.9 50.6 Elements B C D Rating Factor (%) 95 100 110 105 2 5 Observations (minutes) 4 2 3 3 12 11 13 15 21 23 18 14 8 6 12 7 5 3 9 6 7 4 4 2 12 21 23 8 6 8 23 10 19 4 10 12 13 10 5 14 29 12 23 15 12 8arrow_forwardThe results of a time study to perform a quality control test are shown in the following table: *Disregard employee is smoking a cigarette (included in personal time). The allowance factor is given to be 25%. a) The normal time for the complete operation = b) The standard time for this process = Performance Observation (minutes per cycle) Element Rating 1 2 3 4 5 1 95% 1.5 1.8 23 2 110% 0.8 0.5 90% 0.5 0.4 4 85% 0.6 0.9 8549 1.8 1.9 1.4 0.6 3.7* 0.6 0.6 0.4 0.4 0.7 0.7 0.7 minutes (round your response to two decimal places). minutes (round your response to two decimal places).arrow_forward
- . Given the following information, determine the sample sizeneeded if the standard time estimate is to be within 5 percent ofthe true mean 97 percent of the time. Work Element Standard Deviation (minutes) Mean Observed Time (minutes)l 0.20 1.102 0.10 0.803 0.15 0.904 0.10 1.00arrow_forwardClaudine Soosay recorded the following times assembling a watch: Observation No. 1 2 3 4 5 6 7 8 Performance rating is given as 95%. a) The average time of Claudine for the operation = Time (minutes) 0.11 0.09 0.11 0.09 0.15 0.10 0.09 0.10 Observation No. 9 10 11 12 13 14 15 16 minutes (round your response to three decimal places). Time (minutes) 0.11 0.09 0.11 0.10 0.11 0.12 0.14 0.10arrow_forwardEach year, Lord & Taylor, Ltd., sets up a gift-wrappingstation to assist its customers with holiday shopping. Preliminaryobservations of one worker at the sta tion produced the followingsample time (in minutes per package): 3.5, 3.2, 4. 1, 3.6, 3.9.Based on this small sample, what number of observations wouldbe necessa ry to determine the true cycle time with a 95% confidencelevel and an accuracy of ± 5%?arrow_forward
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