Mrs. Crabapple has a class with three students, and she has had four quizzes so far this semester. She has created control charts to determine ifthe variation in students' scores from quiz to quiz is exhibiting only natural variation. Each of the quiz scores are shown below. The upper andlower control limits for the x-bar chart are 109.6 and 34.9, respectively. The upper and lower control limits for the R chart are 93.95 and 0,respectively.Quiz Bart Lisa Nelson1 75 100 502 62 82 723 90 90 904 60 86 10Is the process in control?O A. YesOB. No

A control chart is a statistical process control tool that is used to monitor and analyze the…

Answered: Mrs. Crabapple has a class with three…

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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A Quality Analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results: For upper and lower control limits of 23.29 and 16.71, which machine(s), if any, appear(s) to have an out-of-control process mean?
A woodworker is concerned about the quality of the finished appearance of her work. She has finished a total of 50 unit split-willow hand-woven baskets. However, she has found the following number of finish defects in ten units sampled: 4,0,3,1,2,0,1,2,0,2. Calculate the average number of defects per basket. If 3-sigma control limits are used, calculate the lower control limit and upper control limit.
One of the stages in the process of making denim cloth at the Southern Mills Company is to spin cotton yarn onto spindles for subsequent use in the weaving process. Occasionally the yarn breaks during the spinning process, and an operator ties it back together. Some number of breaks is considered normal; however, too many breaks may mean that the yarn is of poor quality. In order to monitor this process, the quality-control manager randomly selects a spinning machine each hour and checks the number of breaks during a 15-minute period. Following is a summary of the observations for the past 20 hours. Construct a c-chart using 3 limits for this process and indicate if the process was out of control at any time.
Your supervisor, Lisa Lehmann, has asked that you report on the output of a machine on the factory floor. This machine is supposed to be producing optical lenses with a meanweight of 50 grams and a range of 3.5 grams. The following table contains the data for a sample size of n = 6 taken during the past 3 hours: a) What are the :X-chart control limits when the machine is working properly?b) What are the R-charL control limits when the machine is working properly?c) What seems to be happening? (Hint: Graph the data points. Run charts may be helpful.)
A Quality Analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results : Machine #1 measurements [14, 13, 24, 22]; Machine #2 measurements [ 14, 19, 23, 14]; Machine #3 measurements [ 14, 16, 13, 16]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? a. 24.65and 9.013 b. 22.43and 11.24 c. 18.9and 14.76 d. 39.83and -6.167
An airline company wishes to reduce the customer waiting time at the gates at a major airport using Taguchi Design of Experiments. The management decides to use Taguchi design of experiments for this project. Control Factors Level 1 Level 2 Assigned seating Yes (Y) No (N) Number of check-in bags allowed 1 2 Food and beverage supply on flight Beverage only (B) Food and Beverage (FB) Since there are 3 control factors with 2 levels in each, a total of 8 “runs” are possible. However, since performing the experiment with all possible runs is time-consuming, the management decides to consider only 4 runs. The noise factors are four different gates assigned to the airline. The experiment data is shown in the following table: Assigned Bags Food/Bev Gate 1 Gate 2 Gate 3 Gate 4 Y 1 B 31 27 29 32 Y 2 FB 46 40 38 35 N 1 FB 31 29 28 37 N 2 B 45 43 42 41 Make recommendations to the…
Thirty patients who check out of the Rock Creek County Regional Hospital each week are asked to complete a ques-tionnaire about hospital service. Since patients do not feel well when they are in the hospital, they typically are very critical of the service. The number of patients who indi-cated dissatisfaction of any kind with the service for each 30-patient sample for a 16-week period is as follows:Construct a control chart to monitor customer satisfactionat the hospital using 3 limits and determine if the processis in control.
The chair of the operations management department at Quality University wants to construct a p-chart for determining whether the four faculty teaching the basic P/OM course are in control with regard to the number of students who fail the course. Accordingly, he sampled 100 final grades from last year for each instructor, with the following results Instructor Number of Failures Prof. A 13 Prof. B 0 Prof. C 11 Prof. D 16 What is the estimate of the mean proportion of failures for these instructors?
A hospital manager receives a certain number of complaints each day about the hospitals service. Complaints for 15 days are given in the table shown. What are the control limits when one will construct a control chart using three sigma limits? Days Number of Complaints 1 4 2 6 3 4 4 5 5 4 6 8 7 6 8 7 9 5 10 3 11 5 12 4 13 4 14 6 15 4
what types of error are attached in statistical process control? define and draw example. Sub: operation and supply chain management
A. Choudhury’s bowling ball factory in Illinois makes bowling balls of adult size and weight only. The standard devia-tion in the weight of a bowling ball produced at the factory is known to be 0.12 pounds. Each day for 24 days, the averageweight, in pounds, of nine of the bowling balls produced that dayhas been assessed as follows: a) Establish a control chart for monitoring the average weights of the bowling balls in which the upper and lower control lim-its are each two standard deviations from the mean. What are the values of the control limits?b) If three standard deviations are used in the chart, how do thesevalues change? Why?
50 motor generators are inspected per day from a stable process. The best estimate of the fraction of nonconforming is 0.076. Determine the centeral line and control limits. On a particular day, 5 nonconforming generators were discovered. Is this process in or out of control? For the information given in the problem, construct a np-chart

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