Operations Management
13th Edition
ISBN: 9781259667473
Author: William J Stevenson
Publisher: McGraw-Hill Education
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Chapter 10, Problem 17P
Summary Introduction
To determine: The action or decision to be when the specifications are not met.
Introduction: Quality is a measure of excellence or a state of being free from deficiencies, defects and important variations. It is obtained by consistent and strict commitment to certain standards to attain uniformity of a product to satisfy consumers’ requirement.
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The process specifications are 9.85 and 10.85 minutes. Based on the data given, does it appear that specifications are being met?
Sample 1 Sample 2 Sample 3 Sample 4
Sample 5
10.5
10.1
11.0
10.6
10.1
10.3
10.7
10.5
10.0
10.8
10.1
10.8
Totals 42.6
40.7
42.1
Yes
O No
10.8
10.0
10.5
10.2
41.5
10.3
10.2
10.9
10.3
41.6
A time study has revealed an average observed time of 4 minutes, with a standard deviation of 1.20 minutes. These figures are based on a sample of 33 cycles. Is this sample large enough for analyst Anand Paul to be 90.0% confident that the standard time is within 5% of the true value?
The required sample size is (enter your response rounded up to the nearest whole number).
Is the sample large enough?
Yes
No
A time study has revealed an average observed time of 5 minutes, with a standard deviation of 1.25 minutes. These figures are based on a sample of 75 cycles. Is this sample large enough for analyst Anand Paul to be 99.73% confident that the
standard time is within 5% of the true value?
The required sample size is (enter your response as a whole number).
Is the sample large enough?
O No
O Yes
Chapter 10 Solutions
Operations Management
Ch. 10.2 - A potato chip is a delicate thing Fragile A pound...Ch. 10.2 - A potato chip is a delicate thing Fragile A pound...Ch. 10.5 - It's estimated that more than 7 000 hospital...Ch. 10.5 - It's estimated that more than 7 000 hospital...Ch. 10 - Prob. 1DRQCh. 10 - Prob. 2DRQCh. 10 - Prob. 3DRQCh. 10 - Prob. 4DRQCh. 10 - Prob. 5DRQCh. 10 - Prob. 6DRQ
Ch. 10 - Prob. 7DRQCh. 10 - Prob. 8DRQCh. 10 - Prob. 9DRQCh. 10 - Prob. 10DRQCh. 10 - Prob. 11DRQCh. 10 - Prob. 12DRQCh. 10 - Prob. 13DRQCh. 10 - Prob. 14DRQCh. 10 - Prob. 15DRQCh. 10 - Prob. 16DRQCh. 10 - Prob. 1TSCh. 10 - Prob. 2TSCh. 10 - Prob. 3TSCh. 10 - Prob. 1CTECh. 10 - Prob. 2CTECh. 10 - Prob. 3CTECh. 10 - Prob. 4CTECh. 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 - A production process consists of a three-step...Ch. 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. 1.1CQCh. 10 - Prob. 2.1CQCh. 10 - Prob. 2.2CQCh. 10 - Prob. 2.3CQCh. 10 - Prob. 2.4CQ
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- Time left 1:08:00 A can filling process at a beverage manufacturing factory is assumed to be in control with limits of 84 +3 had sample averages for the x-bar chart of the following: 87.1,87, 87.2, 89, 90, 88.5, 89.5, and 88. Which of the following statement below are correct? O a. Process mean is out-of-control O b. Not enough information to determine O c. Process mean is in-control O d. None is correct NEXT PAGE AGE o 日自 nere to searcharrow_forwardTime left 0:08:09 In statistical process control, the hourly samples are taken. The sample means are: 156.46, 199.62, 189.31, 102.22, and 112.09 respectively. Also, the ranges of these samples are 11.97, 12.17, 13.94, 11.86, and 11.83 respectively. If the upper control limit of X-bar chart is 157.87, what is the sample size of each sample? O a. 4 O b. 7 O c. 5 O d. 6 O e. None is correct CLEAR MY CHOICE S PAGE NEXT PAGEarrow_forward. Consider Figure 3 and suggest the model from the following list that best characterises the process: Figure 3: sample size = 10000 0.9 0.8 lacf Opacf 0.7 0.6 0.5 0.4 0.3 0.2 0.1 2 3 6 1 7 8. 10 -0.1 Lags (a) An AR(1) (b) An AR(2) (c) An ARMA(1,1) (d) An MA(3) acf and pacf tarrow_forward
- A hospital is using X bar and R charts to record the time it takes to process patient account information. A sample of five applications is taken each day. The first four week's (20 days) data give the following values: X=16 min R= 7 min The upper and lower specifications are 21 minutes and 13 minutes respectively. What is the CPK of this process?arrow_forwardCheckout time at a supermarket is monitored using a mean and a range chart. Six samples of n = 20 observations have been obtained and the sample means and ranges computed: Sample Mean Range 1 3.06 .42 2 3.15 .50 3 3.11 .41 4 3.13 .46 5 3.06 .46 6 3.09 .45 Using the factors in Table 10.3 , determine upper and lower limits for mean and range charts. Is the process in control?arrow_forwardTime left 0:17:56 In statistical process control, the hourly samples are taken. The sample means are: 156.46 199.62, 189.31, 102.22, and 112.09 respectively. Also, the ranges of these samples are 11.97, 12.17, 13.94, 11.86, and 11.83 respectively. If the upper control limit of X- bar chart is 159.11, what is the sample size of each sample? O a. None is correct O b. 5 Oc. O d. 7 е. 4arrow_forward
- (1) Sample size is the number of samples you collected in quality management. A v A True B False (2) If an individual observation is above the UCL or below the LCL for the mean chart, the mean chart is out of control. A A True B False (3) A process is in control if BOTH the mean chart and the p chart are in control. A True B False (4) In "Slack Time Remaining (STR)" approach, the slack time remaining = Processing Time - Due Date. B v A True B. Falsearrow_forwardWhat is the Mean absolute percent error (MAPE)?arrow_forwardSix samples of five observations each have been taken for a process. The sample means and ranges computed (in minutes) are, (mean, range): (3.55, 0.76), (4.03, 0.7), (3.72, 0.41), (3.74, 0.48), (4.09, 0.76), and (3.74, 0.62). Compute the upper control limit a. 4.11 b. 4.172 c. 2.451 d. 2.832arrow_forward
- Waiting time (minute) at a Tim Horton is monitored using sample mean and range control charts. Six samples of n = 10 observations have been obtained and the sample means and ranges computed (in minutes): Determine the upper and lower limits for sample mean and range control charts. Is the process in control? Draw appropriate control chart (s).arrow_forwardBackground information: Allison collected additional days of data to monitor the process. Steps to monitor using the control charts: Now monitor the process. An additional ten days of data have been collected, see table labeled “1st 10 Days of Monitoring Reservation Processing Time” in the Data File. Develop Xbar and R charts for the 1st 10 days of monitoring. Plot the data for the 1st 10 days on the Xbar and R charts. Is the process in control? If the control chart indicates an out-of-control process, note which days, the pattern, and whether it is the Xbar or R chart. Now that we have set up the control charts using enough data from a stable process, the 30 days of data, we will monitor the process. While monitoring the process, what will we use as the lower control limit for the X-bar Chart to compare against our new x-bar values ? Enter your response to three decimal places. You do not need to include the units (minutes), ONLY the numeric value. USE EXCELL DATA TO GET…arrow_forwardThe results of a time study to perform a quality control test are shown in the following table: Performance Observation (minutes per cycle) Element Rating 1 4 5 94% 1.5 2.0 1.8 1.5 1.5 2 110% 0.8 0.5 0.7 3.9* 0.6 3 82 % 0.4 0.5 0.5 0.3 0.3 4 95% 0.5 0.9 0.7 0.6 0.7 *Disregard-employee is smoking a cigarette (included in personal time). The allowance factor is given to be 25%. a) The normal time for the complete operation = minutes (round your response to two decimal places). b) The standard time for this process = minutes (round your response to two decimal places).arrow_forward
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