OPERATIONS MANAGMENT IN...-ACCESS
7th Edition
ISBN: 9781259716225
Author: SCHROEDER
Publisher: MCG
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Question
Chapter 9, Problem 9P
a)
Summary Introduction
To determine: The CL, and control limits for X bar and R charts.
b)
Summary Introduction
To compute: The mean and range for the sample for the past 6 days and identify if its changes can be compared to that of the past year.
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A teller at a drive-up window at a bank had the following service times (in minutes) for 20 randomly selected customers:
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a.
Determine the mean of each sample.
b.
If the process parameters are unknown, estimate its mean and standard deviation.
c.
Construct control charts for means and ranges using Table 10.3. Are any samples beyond the control limits? If so, which one(s)?
d.
If the process has a known mean of 4.4 and a known standard deviation of .18, what would three-sigma control limits be for a mean chart? Are any sample means beyond the control limits? If so, which one(s)?
Boston Electric Generators has been getting manycomplaints from its major customer, Home Station, about thequality of its shipments of home generators. Daniel Shimshak,the plant manager, is alarmed that a customer is providing himwith the only information the company has on shipment quality.He decides to collect information on defective shipments througha form he has asked his drivers to complete on arrival at customers'stores. The forms for the first 279 shipments have been turnedin. They show the following over the past 8 weeks: Even though Daniel increased his capacity by adding more workersto his normal contingent of 30, he knew that for many weekshe exceeded his regular output of 30 shipments per week. Areview of his turnover over the past 8 weeks shows the following: a) Develop a scatter diagram using total number of shipmentsand…
Problem 10-5 (Algo)
Using samples of 196 credit card statements, an auditor found the following:Use Table-A.
Sample
1
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4
Number with errors
4
3
6
9
Click here for the Excel Data File
a. Determine the fraction defective in each sample. (Round your answers to 4 decimal places.)
b. If the true fraction defective for this process is unknown, what is your estimate of it? (Round your answer to 1 decimal place.)
c. What is your estimate of the mean and standard deviation of the sampling distribution of fractions defective for samples of this size? (Round your intermediate calculations and final answers to 4 decimal places.)
d. What control limits would give an alpha risk of .03 for this process? (Round your intermediate calculations to 4 decimal places. Round your "z" value to 2 decimal places and other answers to 4 decimal places.)
e. What alpha risk would control limits of .0470 and .0092 provide? (Round your intermediate calculations to 4 decimal…
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- One of New England Air's top competitive priorities is on-time arrivals. Quality VP Clair Bond decided to personally monitor New England Air's performance. Each week for the past 30 weeks, Bond checked a random sample of 100 flight arrivals for on-time performance. Sample (week) Late Flights Sample (week) Late Flights1 4 16 32 3 17 23 11 18 104 2 19 25 1 20 16 2 21 17 4 22 208 7…arrow_forwardOne of New England Air's top competitive priorities is on-time arrivals. Quality VP Clair Bond decided to personally monitor New England Air's performance. Each week for the past 30 weeks, Bond checked a random sample of 100 flight arrivals for on-time performance. Sample (week) Late Flights Sample (week) Late Flights1 3 16 32 3 17 23 11 18 64 2 19 35 1 20 26 2 21 17 5 22 228 7 23 39 11 24 110 0 25 211 3 26 112 5 27 013 2 28 114 2 29 415 7 30 5 a) The overall fraction of late flights is [ 0.04 ] enter your response here (enter your response as a real number rounded to two decimal places.) Using a 95% confidence level, the upper and lower control limits are: Upper control limit (UCLp)= enter your response here [ ? ] (enter your response as a fraction between 0 and 1, rounded to four decimal places) Lower control limit (LCLp) =…arrow_forwardStudy the types of charts for a new business normally uses. Are they more likely to be pie charts, bar charts, line charts, or some other types of charts?arrow_forward
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