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: 9780134741062
Author: Lee J. Krajewski, Manoj K. Malhotra, Larry P. Ritzman
Publisher: PEARSON
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Chapter 3, Problem 28P

(a)

Summary Introduction

Interpretation: The control limits for the mean and the range chart are to be determined.

Concept Introduction:

The control chart is used to determine the changes in the process over the time. The control chart consists three lines which are upper control limit line, lower control limit line and central line.

(b)

Summary Introduction

Interpretation: The capability of the process to meet the required specification is to be determined.

Concept Introduction:

The control chart is used to determine the changes in the process over the time. The control chart consists three lines which are upper control limit line, lower control limit line and central line.

(c)

Summary Introduction

Interpretation: The percent of the output which will fall outside the specification limit when the process is not capable is to be determined.

Concept Introduction:

The control chart is used to determine the changes in the process over the time. The control chart consists three lines which are upper control limit line, lower control limit line and central line.

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Cartons of Plaster are supposed to weigh exactly 32 ounces. Inspectors want to develop process control charts. They take five samples of six (6) boxes each and weigh them. Sample means (X-bar) are: 33.8, 34.6, 34.7, 34.1, and 34.2 respectively. Also, the corresponding ranges are: 1.1, 0.3, 0.4, 0.7, and 0.3, respectively. The lower and upper control limits of the xbar-chart are respectively O a. 33.12 and 34.12 b. 34.01 and 34.55 O c. 30.11 and 40.15 O d. None is correct O e. 37.01 and 39.23
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