Operations Management: Processes And Supply Chains (12th Edition) (what's New In Operations Management)
Operations Management: Processes And Supply Chains (12th Edition) (what's New In Operations Management)
12th Edition
ISBN: 9780134742205
Author: Lee J. Krajewski, Manoj K. Malhotra, Larry P. Ritzman
Publisher: PEARSON
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Chapter 3, Problem 3P

(a)

Summary Introduction

Interpretation: R and X¯ chart for the given process is to be drawn by calculating control limits.

Concept Introduction:

The R chart is used to observe the deviation of a process on the basis of samples taken from the process at a given timeframe. X-bar charts are used to observe the arithmetic means of consecutive samples of constant size, n.

(b)

Summary Introduction

Interpretation: Whether the process is in control or not.

Concept Introduction: Calculation from part a has to be examined closely to determine whether the process is in control or not.

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Rosters Chicken advertises " lite" chicken with 30% fewer calories than standard chicken. When the process for "lite" chicken breast production is in control, the average chicken                   breast contains 420 calories, and the standard deviation in caloric content of the chicken breast population is 25 calories. Rosters wants to design an x-chart to monitor the caloric content of chicken breasts, where 25 chicken breasts would be chosen at random to form each sample.a) What are the lower and upper control limits for th.is chart if these limits are chosen to be four standard deviations from the target?b) What a re the limits with three standard deviations from the target?
The Pet-Pal Company produces delicious dog treats. Management wants the filling process to be properly adjusted so that the process average weight per packet is 45 grams. To make sure that the process is in control, an inspector at the end of the filling process periodically selects a random sample of 8 packets and weighs each packet. The mean and range for each sample are then recorded. The results from the last 5 samples are shown in the table below. Sample Mean Range 1 42 2 22 4 47 7 3 49 45 44 43 8 6 50
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