Operations Management
11th Edition
ISBN: 9780132921145
Author: Jay Heizer
Publisher: PEARSON
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Chapter 10, Problem 31P
Summary Introduction
To determine: The
Introduction: Sample size is required to determine the number of observations that are necessary to find the true cycle time.
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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?
What is the answer of this question ?
Claudine 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
0.10
Chapter 10 Solutions
Operations Management
Ch. 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. 9DQCh. 10 - Prob. 10DQ
Ch. 10 - Prob. 11DQCh. 10 - Prob. 12DQCh. 10 - Prob. 13DQCh. 10 - Prob. 14DQCh. 10 - Prob. 1PCh. 10 - Draw an activity chart for a machine operator with...Ch. 10 - Prob. 3PCh. 10 - Prob. 4PCh. 10 - Prob. 5PCh. 10 - Prob. 6PCh. 10 - Prob. 7PCh. 10 - Prob. 8PCh. 10 - Prob. 9PCh. 10 - Prob. 10PCh. 10 - Prob. 11PCh. 10 - Prob. 12PCh. 10 - Prob. 13PCh. 10 - Prob. 14PCh. 10 - Prob. 15PCh. 10 - Prob. 16PCh. 10 - Prob. 17PCh. 10 - Prob. 18PCh. 10 - Prob. 19PCh. 10 - Prob. 20PCh. 10 - Prob. 21PCh. 10 - Prob. 22PCh. 10 - Prob. 23PCh. 10 - Prob. 24PCh. 10 - Prob. 25PCh. 10 - Prob. 26PCh. 10 - Prob. 27PCh. 10 - Prob. 28PCh. 10 - Prob. 29PCh. 10 - Prob. 30PCh. 10 - Prob. 31PCh. 10 - Prob. 32PCh. 10 - Prob. 33PCh. 10 - Prob. 34PCh. 10 - Prob. 35PCh. 10 - Prob. 36PCh. 10 - Prob. 37PCh. 10 - Prob. 38PCh. 10 - Prob. 1CSCh. 10 - Prob. 2CSCh. 10 - Prob. 3CSCh. 10 - Prob. 4CSCh. 10 - Prob. 1VCCh. 10 - Prob. 2VCCh. 10 - Prob. 3VCCh. 10 - Prob. 4VC
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- 1arrow_forwardK Claudine Soosay recorded the following times assembling a watch: Observation No. 1234567co 8 Time (minutes) 0.12 0.10 0.11 0.11 0.15 0.10 0.10 0.10 Observation No. 9 10 11 12 13 14 15 16 Time (minutes) 0.11 0.08 0.11 0.10 0.10 0.11 0.14 0.08arrow_forwardQuestion 3 A coffee producer wishes to produce new 50-gram pack for people who like to bring their own coffee when they travel. The producer asked your help to monitor the quality of the process by setting up the appropriate control charts. Based on the data shown in the table, is the process in control? Sample 2 3 4 5 6 7 8 9 2 3 4 Values for A2, D3 and D4 Sample Size n 10 1 54.5 50.6 51.1 52.7 51.7 5 6 7 8 9 10 11 51.1 54.0 53.2 51.9 A2 D3 1.88 0 1.02 0 0.73 0 0.58 0 0.48 0 0.42 0.08 0.37 0.14 0.34 0.18 0.31 0.22 0.29 0.26 12 0.27 0.28 Show all your workings clearly. 2 54.3 53.5 54.3 52.1 51.2 Observation 51.5 52.3 50.4 50.2 D4 3.27 2.57 2.28 2.11 2.00 1.92 1.86 1.82 1.78 1.74 1.72 3 53.8 53.2 50.4 51.3 54.7 54.7 54.7 53.4 50.2 4 50.4 54.9 50.7 51.0 54.3 50.4 51.4 51.4 52.9arrow_forward
- QUESTION 2 South Africa Airways would like to monitor its airline's performance. Each week for the past 20 weeks, they checked each week a random sample of 100 flight arrivals for "one-time" performance. The table that follows contains the number of flights that did not meet South Africa Airways definition of "one time": Week Late flights 10 9 11 39103422822 10 11 12 13 14 15 16 17 18 19 20 19 2.1 Which control chart is appropriate to analyze the above data? Justify your answer. 2.2 Calculate the upper and lower control limits for this chart @ 99.73% confidence level. 2.3 Draw the chart and interpret it. (3) (10) (9) QUESTION 3 Two machines are currently in use in a process at a local manufacturing plant. The standards for this process are LSL 400 and USL .403. Machine One is currently producing with mean .401 and a standard deviation 0004. Machine Two is currently producing with mean = 4015 and a standard deviation = .0005. 3.1 Which of the…arrow_forward8. A teller at a drive-up window at a bank had the following service times (in minutes) for 20 randomly selected customers: SAMPLE 1 2 3 4 4.5 4.6 4.5 4.7 4.2 4.5 4.6 4.6 4.2 4.4 4.4 4.8 4.3 4.7 4.4 4.5 4.3 4.3 4.6 4.9 Select a chart to monitor the central tendency of the process, what are the 3-sigma control limits using a mean chart? Keep 3 decimal places. Select one: a. LCL = 4.212, UCL = 4.788 b. LCL = 4.414, UCL = 4.586 c. LCL = 4.245, UCL = 4.755 d. None of the other options. e. LCL = 4.385, UCL = 4.615arrow_forwardQUESTION 18 Hank Kolb, the quality assurance manager is assessing the capability of a process that puts pressurized grease in an aerosol can. For the pressure of aerosol cans, the process mean is 78.24 and the process standard deviation is 1.38, and the upper and lower customer specifications are 82.50 and 77.50 respectively. Hank considers adjusting the process mean to improve its process capability. Then what is the maximum increase in Cpk he can achieve by adjusting the process mean? (Round to 2 decimal places)arrow_forward
- State some of the main uses of time study information.arrow_forwardQuestion : A process that is considered to be in control measures an ingredient in ounces. Below are the last ten samples (each of size n=5) taken. The population standard deviation is 1.36. SAMPLE 1 2 3 4 5 6 7 8 9 10 5 6 9 10 9 10 9 12 8 9 8 9 9 8 12 11 9 9 6 10 6 8 5 7 10 8 10 9 4 12 4 7 3 8 8 6 12 10 4 11 5 4 2 9 8 6 8 6 5 7 Using information from the above table: Calculate the standard deviation of the sample means, σ×. Determine the control limits for the mean chart, using A2 and σ× if z=3. Determine the control limits for the range chart. Construct mean (using A2) and range control charts by using information from (ii) and (iii). Comment on your results.arrow_forwardQuestion 5 To move from a 3-Sigma process to a 6-Sigma process, the largest challenge is generally tc O Decrease the process output O Decrease the process variability O Increase the process variability O Increase the process inspectionsarrow_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_forwardQuestion 8 A schematic technique to discover possible causes of quality problems in an overall process is a: O Check Sheet O Cause-and-Effect Diagram O Scatter Diagram O Flow Chart O Pareto Chartarrow_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_forward
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