Principles Of Operations Management
11th Edition
ISBN: 9780135173930
Author: RENDER, Barry, HEIZER, Jay, Munson, Chuck
Publisher: Pearson,
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Question
Chapter 10, Problem 24P
Summary Introduction
To determine: The normal time and standard time for the operations.
Introduction: Time study is the basis that helps set the standard time; it would time a sample of the performance of the worker.
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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
83
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 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)…
Compare stopwatch time study and work sampling.
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 10 Solutions
Principles Of Operations Management
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- What are the trade offs in choosing between time study and work sampling for work measurement.arrow_forwardA 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% 2.576arrow_forwardAn 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%?arrow_forward
- (a) What is a technique for estimating the percent of the time a worker spends on various tasks? A) stopwatch time study B) simultaneous motion study C) work sampling D) standard elemental (historical) times E) predetermined (published) time standards (b) A bank manager wants to determine the percent of the time the bank's tellers are working and idle. He decides to use work sampling, and his initial estimate is that the tellers are idle 22% of the time. Approximately how many observations should be taken to be 95% confident that the results will not be more than 5% away from the true result? A)6 B) 16 C) 203 D) 264 E) 246arrow_forwardState some of the main uses of time study information.arrow_forwardObservations (mins) Day 1 2 3 4 5 6 1 21 30 22 25 31 30 2 23 29 17 32 28 31 3 22 28 33 26 32 31 4 33 30 22 35 29 30 5 35 27 36 28 31 27 6 27 32 30 35 32 32 7 35 32 28 35 35 27 8 26 30 31 37 39 31 9 36 36 34 39 31 25 10 26 42 35 35 27 37 The patient surveys indicate that they are willing to wait between 15 and 35 minutes before seeing Dr. Patel. Calculate the process capability index and capability ratio at the three-sigma level and interpret your results.arrow_forward
- Each 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_forwardThe “worker” in this scenario had to perform a candy-sorting task and the rest of the class had to record the observed times (OT) for the task. It was decided that the rating for the “worker” was 100%. Given the following table, find the standard time for each element. Write your answers in order from Element #1 --> Element #5. Answers must have one decimal place: e.g. 3.0 or 12.5. Round up if necessary. Assume a total allowance of 5%. In your equation you will use for ST, consider allowance to be 0.05. Element Trail 1 Trial 2 Standard Time 1 Walk to podium 3 sec 3 sec 2 Fill mug 5 sec 6 sec 3 Walk to desk/sit 5 sec 4 sec 4 Sort Candy 12 sec 12 sec 5 Walk to desk 4 sec 4 secarrow_forwardState and describe some of the limitations of time study method ?arrow_forward
- What situations call for the use of work sampling instead of time study?arrow_forwardWhat are the main uses of time study information?arrow_forwardTime study mainly addresses:a) Timing all workers’ performances for setting standardtimesb) Improving the working environment for setting standardtimesc) Timing a sample of worker’s performance for settingstandard timesd) Timely review of the workloads for setting standardtimese) All of the abovearrow_forward
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