Operations Management
14th Edition
ISBN: 9781260238891
Author: Stevenson
Publisher: MCG
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Chapter 7, Problem 16P
Summary Introduction
To determine: The number of observations.
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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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…
. 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 1.00
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%?
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. 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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, operations-management and related others by exploring similar questions and additional content below.Similar questions
- Give other examples or illustrations of work sampling studies.arrow_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_forwardWhat situations call for the use of work sampling instead of time study?arrow_forward
- How are devices such as flow process charts and worker-machine charts useful?arrow_forwardTime left 1:06:0- In a fabric manufacturing factory, the quality control process using control charts from SPC. In an hour there are a total of 5 samples are taken each having 4 observations regarding the thickness of fabric in measured in millimeters. In a particular hour, the sample means (X-bar) are noted to be: 156.46, 199.62, 189.31, 102.22, and112.09 respectively. In the same sample, the corresponding ranges are: 11.97, 12.17, 13.94, 11.86, and 11.83 respectively. What are the lower and upper control limits for the R chart? O a. 0,28.17 O b. 0,31.17 OC None is correct O d. 0,24.71 O e. 0,30.47 Of. 0,29.17 US PAGE NEXT PAGE O # C a pe here to search Prt F10 F12 %23 & 2 . 3 5 6 V. 8. R T. Y U P 41 S F J G y H K L / C V } BYN i 10 Alt Alt Ctrlarrow_forwardDescribe the steps involved in conducting a work sampling study.arrow_forward
- Compare stopwatch time study and work sampling.arrow_forwardPrepare a run diagram for this emergency call data. Use five-minute intervals (i.e., count the calls received in each five- minute interval. Use intervals of 0-4, 5-9, etc.). Note: Two or more calls may occur in the same minute; there were three operators on duty this night. What can you conclude from the run chart? Call Time Call Time Call Time 1 2 3 4 5 6 7 8 9 10 11 1:03 1:06 1:09 1:11 1:12 1:17 1:21 1:27 1:28 1:29 1:31 12 13 14 15 16 17 18 19 20 21 22 1:36 1:39 1:42 1:43 1:44 1:47 1:48 1:50 1:52 1:53 1:56 23 24 25 26 27 28 29 30 31 32 33 1:56 2:00 2:00 2:01 2:02 2:03 2:03 2:04 2:06 2:07 2:08 Call 34 35 36 37 38 39 40 41 42 Time 2:08 2:11 2:12 2:12 2:13 2:14 2:14 2:16 2:19 a. re-organize the above data for your analysis (using five-minute intervals; 0-4, 5-9, etc) b. Provide your diagram that shows the number of emergency calls by eacn five-minute intervals from 1am to 2:20am c. what can you conclude from the chart?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_forward
- 10. How are devices such as flow process charts and worker-machine charts useful? 11. What is a time standard? What factors must be taken into account when developing standards?arrow_forwardII. Exercise You have been asked to develop a work sample for a receptionist position in a three-person law firm. The lawyers believe this might be the best way to evaluate applicants, especially because they are seeking someone with a disability and they do not believe in the practical credibility of standardized measures. 1. What information do you need to design the work sample? 2. What materials do you need? 3. What are the criteria for your observation schedule as the consumer performs the work sample?arrow_forwardWhat 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.arrow_forward
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