Operations Management: Processes and Supply Chains, Student Value Edition Plus MyLab Operations Management with Pearson eText -- Access Card Package (11th Edition)
Operations Management: Processes and Supply Chains, Student Value Edition Plus MyLab Operations Management with Pearson eText -- Access Card Package (11th Edition)
11th Edition
ISBN: 9780134111056
Author: Lee J. Krajewski, Manoj K. Malhotra, Larry P. Ritzman
Publisher: PEARSON
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Chapter 3, Problem 11P
Summary Introduction

Case Summary: In Gr’s Garage, the proportion of average number of customers who comes back again for the same fault is 0.10, during the warranty period of 30 days. Every month, 100 customers are tracked by Gr, in order to find out whether they are returning for same repair works during the warranty period and the same is plotted as proportion to report progress against goal. By setting the control limits on both sides of goal, at two standard deviations, the control limit for the chart needs to be determined. From the sample group 8 customers out of 100, has returned for repairs, for which the repair process is under control or not, needs to be assessed.

Interpretation: The standard deviation gives information as to how various values are spread out when compared to the mean value.

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Cariveh Co sells automotive supplies from 25 different locations in one country. Each branch has up to 30 staff working there, although most of the accounting systems are designed and implemented from the company's head office. All accounting systems, apart from petty cash, are computerised, with the internal audit department frequently advising and implementing controls within those systems. Cariveh has an internal audit department of six staff, all of whom have been employed at Cariveh for a minimum of five years and some for as long as 15 years. In the past, the chief internal auditor appoints staff within the internal audit department, although the chief executive officer (CEO) is responsible for appointing the chief internal auditor. The chief internal auditor reports directly to the finance director. The finance director also assists the chief internal auditor in deciding on the scope of work of the internal audit department. You are an audit manager in the internal audit…
Cariveh Co sells automotive supplies from 25 different locations in one country. Each branch has up to 30 staff working there, although most of the accounting systems are designed and implemented from the company's head office. All accounting systems, apart from petty cash, are computerised, with the internal audit department frequently advising and implementing controls within those systems. Cariveh has an internal audit department of six staff, all of whom have been employed at Cariveh for a minimum of five years and some for as long as 15 years. In the past, the chief internal auditor appoints staff within the internal audit department, although the chief executive officer (CEO) is responsible for appointing the chief internal auditor. The chief internal auditor reports directly to the finance director. The finance director also assists the chief internal auditor in deciding on the scope of work of the internal audit department. You are an audit manager in the internal audit…
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