Principles Of Operations Management
11th Edition
ISBN: 9780135173930
Author: RENDER, Barry, HEIZER, Jay, Munson, Chuck
Publisher: Pearson,
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Chapter 10, Problem 16P
a)
Summary Introduction
To determine: To find the average time for the operation
Introduction: Time study is the basis that helps to set the standard time; it would time a sample of the performance of the worker.
b)
Summary Introduction
To determine: Thenormal time for the operation
Introduction: Time study is the basis that helps to set the standard time; it would time a sample of the performance of the worker.
c)
Summary Introduction
To determine: To find the standard time for the operation
Introduction: Time study is the basis that helps to set the standard time; it would time a sample of the performance of the worker.
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5. The manager of Asombrado Bounty Office, Charles Badillo, estimates his employees are idle 25%of the time. With that problem, how many work samples are needed to consider within 3%accuracy and have 95.45% confidence level.
6. At ASP Micro Manufacturing, Inc. workers press semiconductor into predrilled slots on printed-circuit boards. Determine the normal time of the operation in seconds. The elemental motions for normal time used by the company are as follows:• Reach 6 inches for semiconductors 10.5 TMU• Grasp the semiconductors 8.0 TMU• Move semiconductor to printed-circuit board 9.5 TMU• Position semiconductor 20.1 TMU• Press semiconductor into slots 20.3 TMU• Move board aside 15.8 TMU
7. The semiconductor used in Costin Calculator has 5 components with the consistency of 90%, 95%,98%, 90%, and 99%, respectively. How reliable is one product of calculator?
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.
The snapback timing method was used to obtain the average times and performance ratings for work elements in a manual repetitive task. (See table below). All elements are worker-controlled and were performance rated at 80%. Element e is an irregular element performed every five cycles. A 15% allowance for personal time, fatigue, and delays isapplied to the cycle. Determine (a) the normal time and (b) the standard time for this cycle. If the worker’s performance during actual production is 120% on all manual elements for 7 actual hours worked on an 8-hour shift, (c) how many units will be produced
Chapter 10 Solutions
Principles Of Operations Management
Ch. 10 - Prob. 1EDCh. 10 - Prob. 1DQCh. 10 - Prob. 2DQCh. 10 - Prob. 3DQCh. 10 - Prob. 4DQCh. 10 - Prob. 5DQCh. 10 - Prob. 6DQCh. 10 - Prob. 7DQCh. 10 - Prob. 8DQCh. 10 - Prob. 9DQ
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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_forwardA worker-machine operation was found to involve 3.3 minutes of machine time per cycle in the course of 40 cycles of stopwatch study. The worker's time-averaged 1.9 minutes per cycle, and the worker was given a rating of 120% (machine rating is 100%). Midway through the study, the worker took a 10-minute rest break. Assuming an allowance factor of 12% of work time, determine the standard time for this job. Hints: you should consider both machine time and machine time together. Also, Allowance only applies to the man, not a machine.arrow_forwardThe owner of Kat Motel wants to develop a time standard for the task of cleaning a cat cage. In a preliminary study, she observed one of her workers perform this task six times, with the following results: Observation 1 2 3 4 5 6 Time (seconds) 52.7 70 53.3 90.3 80.6 86.7 If the employee performance rating is 1.50, what is the standard time for this task with an allowance of 20 percent of job time is used? seconds.arrow_forward
- State and describe some of the limitations of time study method ?arrow_forwardWhat are the trade offs in choosing between time study and work sampling for work measurement.arrow_forwardNine observations from a work measurement study using continuous timing are shown below. Allowances are determined as: personal, five percent; fatigue, six percent; delay, five percent. Use the Work Measurement Excel template to determine the standard time for this operation. Work Observation Element 1 2 3 4 5 6 7 8 9 Performance Rating A 0.10 0.15 0.08 0.06 0.11 0.10 0.16 0.15 0.16 115% B 0.23 0.18 0.23 0.22 0.25 0.24 0.29 0.28 0.28 95% C 0.49 0.52 0.49 0.48 0.47 0.47 0.52 0.49 0.51 105% D 0.62 0.67 0.64 0.59 0.70 0.68 0.68 0.67 0.70 90% E 0.71 0.74 0.73 0.70 0.81 0.81 0.78 0.81 0.83 105% F 1.03 1.03 1.01 1.01 1.08 1.12 1.03 1.09 1.11 100% Round your answer to two decimal places. minutesarrow_forward
- Installing mufflers at the O'Sullivan Garage in Golden, Colorado, involves five work elements. Jill O'Sull ivanhas timed workers performing these tasks seven times, with the results shown in the following table: By agreement with her workers, Jill allows a 10% fatigue factor and a 10% personal-time factor, but no time for delay. To compute standard time for the work operatio n, Jill excludes all observations that a ppear to be unusual or nonrecurring. She does not want an error of mo re than ±5%.a) What is the standard time for the task?b) How many observations are needed to assu re a 95% confidence level?arrow_forwardFind out the standard time using the following data: Average time for machine elements = 6 min. Average time for manual elements = 3 min. Performance rating =110% Allowances = 11%arrow_forwardWhat is the significance of work measurements and time standards to a business? Are there any drawbacks to putting these standards in place?arrow_forward
- Describe some of the limitations of time study method ?arrow_forwardFrank’s Fabricators has collected the following information to develop a standard time for producing their high-volume Navigator III, a universal remote control. All of the times are in minutes. Element (in Minutes) Observations 1 2 3 4 5 6 Cycle 1 1.15 3.07 0.94 1.31 1.49 1.82 Cycle 2 1.13 0.91 1.42 1.70 1.81 Cycle 3 1.17 3.23 0.85 1.26 1.58 1.82 Cycle 4 1.19 0.93 1.37 1.54 1.80 Cycle 5 1.09 3.16 0.93 1.40 1.65 1.83 Cycle 6 1.14 1.01 1.44 1.63 1.88 Rating Factor 1.15 1.20 1.10 1.20 1.15 1.30 Frequency 1.00 0.50 1.0 1.0 1.0 1.0 (a) Calculate the mean observed time for each element. (Round your answers to 3 decimal places, e.g.,5.123.) Element Mean Observed Time 1 1.145 2 1.577 3 0.928 4 1.367 5 1.598 6 1.827 eTextbook and Media Solution Attempts: 3 of 3 used (b) Calculate the normal time…arrow_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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