Ferric chloride is used as a flux in some types of extraction metallurgyprocesses. This material is shipped in containers, and the container weight varies. Itis important to obtain an accurate estimate of mean container weight. Suppose thatfrom long experience a reliable value for the standard deviation of flux containerweight is determined to be 4 lb. How large a sample would be required to construct a95% two-sided confidence interval on the mean that has a total width of 1 lb?2.

ANSWER : The req sample size is approximately 246

Answered: Ferric chloride is used as a flux in…

Practical Management Science

6th Edition

ISBN:9781337406659

Author:WINSTON, Wayne L.

Publisher:WINSTON, Wayne L.

Chapter2: Introduction To Spreadsheet Modeling

Section: Chapter Questions

Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...

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3/4 roller chain is to transmit power from a 17-tooth drive sprocket to 34-tooth sprocket. Centers of the sprockets are 13 inches apart. Estimate the number of teeth in contact with the chain for the larger sprocket.
Auto 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 5 pistons produced each day, the mean and the range of this diameter have been as follows: Day Mean (mm) Range R (mm) 158 4.3 151.2 4.4 155.7 4.2 153.5 4.8 156.6 4.5 What is the UCL using 3-sigma?(round your response to two decimal places). 1. 2. 4.
7
Lay's potato chip filling process has a lower specification limit of 9.5 oz. and an upper specification of 10.5 oz. The mean is 10 oz. What should be the value for standard deviation in this process to achieve a ppm of 5110? A. 0.1786 B. 0.2675 OC. 0.4453 OD. 0.3564
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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 chart is being designed to monitor this variable. The process of sampling speakers 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…
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