Operations Management
17th Edition
ISBN: 9781259142208
Author: CACHON, Gérard, Terwiesch, Christian
Publisher: Mcgraw-hill Education,
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Chapter 9, Problem 2C
Summary Introduction
Case summary:
The case deals with the production process of Company M that includes seven production process. In addition to this, the number of samples collected by the professor is 120 bags. The standard deviation is given as 1.037 grams and the average weight is 49.9783 grams.
To determine: The product that has the highest standard deviation.
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28. A local contractor manufactures the speakers used in telephones. The phone com-
pany requires the speakers to ring at a specified noise level (in decibels). An X
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from the line requires hitting the speakers with a fixed-force clapper and measur-
ing the decibel level on a meter designed for that purpose. The cost of sampling is
$1.25 per speaker. When the process goes out of control, the thickness of the
speakers is incorrect. The cost of searching for an assignable cause is estimated to
be $50. The cost of operating the process in an out-of-control state is estimated to
be $180 per hour. Out of control corresponds to a shift of 2ơ in the decibel level,
and the probability that the process shifts out of control in any hour is .03.
a. The company uses an X chart based on 3ơ limits and subgroups of size 4. What
is its hourly cost?
b. What are the optimal values of n and k for this process and the…
What is a capable process? Is a capable process a perfect process? In other words, does a capable process produce output that meets specifications?
Chapter 9 Solutions
Operations Management
Ch. 9 - Prob. 1CQCh. 9 - Prob. 2CQCh. 9 - Prob. 3CQCh. 9 - Prob. 4CQCh. 9 - Prob. 5CQCh. 9 - Prob. 6CQCh. 9 - Prob. 7CQCh. 9 - Prob. 8CQCh. 9 - Prob. 9CQCh. 9 - Prob. 10CQ
Ch. 9 - Prob. 11CQCh. 9 - Prob. 12CQCh. 9 - Prob. 13CQCh. 9 - Prob. 14CQCh. 9 - Prob. 15CQCh. 9 - Prob. 16CQCh. 9 - Prob. 17CQCh. 9 - Prob. 18CQCh. 9 - Prob. 1PACh. 9 - Prob. 2PACh. 9 - Prob. 3PACh. 9 - Prob. 4PACh. 9 - Prob. 5PACh. 9 - Prob. 6PACh. 9 - Prob. 7PACh. 9 - Prob. 8PACh. 9 - Prob. 9PACh. 9 - Prob. 10PACh. 9 - Prob. 11PACh. 9 - Prob. 12PACh. 9 - Prob. 1CCh. 9 - Prob. 2C
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- Consider the following given below: Week Sales('000) 1. 39 44 40 4 45 38 43 39 What is the Mean Absolute Percent error (MAPE)?arrow_forward16. Six per cent, on average, of manufactured spindles are outside stated tolerances. The spindles are randomly packed in boxes of 50 and dispatched in cartons of 100 boxes. For any one carton, determine the number of boxes likely to contain 0, 1, 2, 3, 4, 5-or-more defectives.arrow_forwardExplain the Cronbach’s Alpha measurement and its internal consistency?arrow_forward
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- Eagletrons are all-electric automobiles produced byMogul Motors, Inc. One of the concerns of Mogul Motors is thatthe Eagletrons be capable of achieving appropriate maximumspeeds. To monitor this, Mogul executives take samples of eight Eagletrons at a time. For each sample, they determine the aver-age maximum speed and the range of the maximum speeds within the sample. They repeat this with 35 samples to obtain 35 samplemeans and 35 ranges. They find that the average sample mean is88.50 miles per hour, and the average range is 3.25 miles per hour.Using these results, the executives decide to establish an R chart.They would like this chart to be established so that when it showsthat the range of a sample is not within the control limits, there isonly approximately a 0.0027 probability that this is due to naturalvariation. What will be the upper control limit (UCL) and thelower control limit (LCL) in this chart?arrow_forwardAuto pistons at Wemming Chung's plant in Shanghai are produced in a forging process, and the diameter is a critical factor that must be controlled. From sample sizes of 10 pistons produced each day, the mean and the range of this diameter have been as follows: a) What is the value of X? x= mm (round your response to two decimal places). Day 1 2 3 4 5 Mean x (mm) 158.9 155.2 155.6 157.5 156.6 Range R (mm) 4.2 4.4 4.3 4.8 4.3arrow_forwardThe Healthy Chocolate Company makes a variety of chocolate candles, including a 12-ounce chocolate bar (340 grams) and a box of six 1-ounce chocolate bars (170 grams). a.Specifications for the 12-ounce bar are 322 grams to 358 grams. What is the largest standard deviation (In grams) that the machine that fills the bar molds can have and still be considered capable if the average fill is 340 grams? (Round your intermediate calculations to 2 decimal places and final answer to 3 decimal places.) Standard deviation b.The machine that filles the bar molds for the 6-ounce bars has a standard deviation of .84 grams. The filling machine is set to deliver an average of 1.04 ounces per bar. Specifications for the six-bar box are 150 to 190 grams per box. Is the process capable? Hint: The variance for the box is equal to six times the bar variance. Convert all calculations Into grams. O Yes O No grams c.What is the lowest setting in ounces for the filling machine that will provide capability in…arrow_forward
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