Principles Of Operations Management
11th Edition
ISBN: 9780135173930
Author: RENDER, Barry, HEIZER, Jay, Munson, Chuck
Publisher: Pearson,
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Chapter 10, Problem 31P
Summary Introduction
To determine: The sample size to know the true cycle time.
Introduction: Sample size is required to determine the number of observations that are necessary to find the true cycle time.
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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 5 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 X-bar chart?
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O a.
None is correct
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O b.
156.55, 170.47
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O C.
144.77, 159.11
O d. 145.40, 190.72
O e. 143.55, 165.47
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142.92, 160.66
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Question 1
This Test: 60 pts possible
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Daily high temperatures in St. Louis for the last week were as follows: 92, 92, 94, 94, 95, 88, 95 (yesterday).
a) The high temperature for today using a 3-day moving average =
degrees (round your response to one decimal place).
b) The high temperature for today using a 2-day moving average =
degrees (round your response to one decimal place).
c) The mean absolute deviation based on a 2-day moving average = degrees (round your response to one decimal place).
%3D
d) The mean squared error for the 2-day moving average =
degrees (round your response to one decimal place).
e) The mean absolute percent error (MAPE) for the 2-day moving average = % (round your response to one decimal place).
13-2. (Pareto Chart & Fishbone Diagram). Smith, Schroeder, and Torn (SST) is a short-haul household furniture moving company. SST"s labor force, selected from the
local community college football team, is temporary and part-time. SST is concerned with recent complaints, as tabulated on the following tally sheet.
Complaint
Broken glass
Delivered to wrong address
Furniture rubbed together while on truck
Late delivery
Late arrival for pickup
/////
///
/////
/////
//
///// /////
Missing items
Nicks and scratches from rough handling /////
Soiled Upholstery
///// /////
Tally
///// /
///
/////
I
//
///// ///// ///// ///
a. Use a Pareto chart to identify the "few vital" complaint problems.
b. Use a cause-and-effect diagram to identify potential causes of the complaints
Chapter 10 Solutions
Principles Of Operations Management
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Ch. 10 - Prob. 10DQCh. 10 - Prob. 11DQCh. 10 - Prob. 12DQCh. 10 - Prob. 13DQCh. 10 - Prob. 14DQCh. 10 - Prob. 1PCh. 10 - Prob. 2PCh. 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 - Virginia College promotes a wide variety of...Ch. 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. 39PCh. 10 - Prob. 40PCh. 10 - Prob. 41PCh. 10 - Prob. 42PCh. 10 - Prob. 44PCh. 10 - Prob. 1CSCh. 10 - Prob. 2CSCh. 10 - Prob. 3CSCh. 10 - Prob. 4CSCh. 10 - Prob. 1.1VCCh. 10 - Prob. 1.2VCCh. 10 - Prob. 1.3VCCh. 10 - Prob. 2.1VCCh. 10 - Prob. 2.2VCCh. 10 - Prob. 2.3VCCh. 10 - Prob. 2.4VC
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- Refer to Table S6.1 - Factors for Computing Control Chart Limits (3 sigma) for this problem. Ross Hopkins is attempting to monitor a filling process that has an overall average of 715 mL. The average range R is 6 mL. For a sample size of 10, the control limits for 3-sigma x chart are: Upper Control Limit (UCL;) = mL (round your response to three decimal places). Lower Control Limit (LCL-) = mL (round your response to three decimal places). The control limits for the 3-sigma R-chart are: Upper Control Limit (UCLR) = mL (round your response to three decimal places). Lower Control Limit (LCLR) = mL (round your response to three decimal places).arrow_forward5. 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?arrow_forwardQUESTION 6 In a burger shop, a sample of 36 days, was taken to study the daily sales, It was found that the mean daily sales are (m) with a standard deviation is (d). The confidence interval for the population mean is computed, the upper confidence limit is 35, and the lower confidence limit is 18 Calculate the value of m? (Round answer to two decimal places ex. 2.09)arrow_forward
- QUESTION 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_forwardHow to Work sampling compared with stopwatch time study?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_forward
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