Homework Answers
30. The purpose of statistical process control is to collect data, setting proper control limits, reevaluation of the implementation of statistical process control.
31. The purpose of making a normal probability plot is to assess whether the data set is normally distributed or not. This is done approximately.
32. The purpose of a Pareto chart is to segregate the important aspects of a problem from the insignificant ones.
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30 In your won words, what is the purpose of statistical process control? 31-What is the...
Unit6: OPTIMIZING AND CONTROLLING PROCESSES THROUGH STATISTICAL PROCESS CONTROL 1. Define the concept of statistical process...
Unit6: OPTIMIZING AND CONTROLLING PROCESSES THROUGH STATISTICAL
PROCESS CONTROL
1. Define the concept of statistical process control SPC?
2. What is SPC key element?
3. Solving the following problem (Using x -charts and R
–charts)?
a. Using this data to solve the problem by using X bar chart and
R chart?
b. What is the difference between X bar chart and R chart?
c. Draw the control chart for both X bar chart and R chart?
d. Explain the result?...
A statistical process control chart example. Samples of 25 parts from a metal punching process are...
A statistical process control chart example. Samples of 25 parts from a metal punching process are selected every hour. Typically, 1% of the parts require rework. Let X denote the number of parts in the sample of 25 that require rework. A process problem is suspected if X exceeds its mean by more than three standard deviations Round your answers to four decimal places (a) If the percentage of parts that require rework remains at 1%, what is the probability...
Control charts for bar x chart and S have been maintained on a process and have...
Control charts for bar x chart and S have been maintained on a process and have exhibited statistical control. The sample size is n=6. The control chart parameters are as follows: Estimate the mean and standard deviation of the process. Assume that the process output is well modeled by a normal distribution. If specifications are 703 and 709, estimate the fraction nonconforming. Suppose the process mean shifts to 702.00 while the standard deviation remains constant. What is the probability of...
Problem no.3 The thickness of a metal part is the quality characteristic that statistical process control...
Problem no.3 The thickness of a metal part is the quality characteristic that statistical process control is being applied to. Measurements are taken from 25 subgroups of subgroup size 5. The sum of the X-bar values 1.5735. The sum of the R-values .0231. Xbar/R Chart for x 0636 06396 Subgroup 10 15 20 25 001 0011 a.) Calculate the trial control limits and centerlines for the X-bar and R charts above b.) Calculate the revised control limits and centerlines for...
Examine the Statistical Process Control outputs below. If the sample size is 3, What are the...
Examine the Statistical Process Control outputs below. If the sample size is 3, What are the UCL and LCL, respectively, for this X-bar chart? Hour X-BAR R 1 3 2 2 5 1 3 4 4 4 2 1 Select one: O a. 4.654 and 2.346 O b. 4.958 and 2.042 O c. 7.26 and -0.26 O d. 5.546 and 1.454 e. Right answer is not listed
A manufacturer of electronic switches wishes to use statistical process control to monitor production. One measurement...
A manufacturer of electronic switches wishes to use statistical process control to monitor production. One measurement on the switches is required to have a mean value 12mA with standard deviation of 1.5mA, and the company intends to use samples of six switches. What will the upper and lower control limits for the x-bar chart?
In your own words, explain the purpose and timing of the process of bank reconciliation.
In your own words, explain the purpose and timing of the process of bank reconciliation.
A certain process is under statistical control and has a mean value of 130 and a...
A certain process is under statistical control and has a mean value of 130 and a standard deviation of 8. The specifications for the process are: a. USL (upper specification limit) = 150 b. LSL(lower specification limit) =100 a. Calculate the cp and cpk b. Which of these indices is a better measure of process capability and why? c. Assuminng a normal distribution what percentage of output is expected to fall ourside the specification. Why is it important to know...
Boxes of cereals are supposed to weigh exactly 14 oz. Inspectors want to develop process control...
Boxes of cereals are supposed to weigh exactly 14 oz. Inspectors want to develop process control charts. They take ten samples of six boxes per sample and weigh them. Based on the following computations of the sample means X-bar and the sample ranges, compute the lower and upper control limits and determine whether the process is in control. Use TABLE 10.2 on page 204 of your textbook to find the parameters for control chart limits. Sample X-Bar Range 1 13.8...
Question 6 (1 point) What does quality mean with respect to project management? Question 6 options:...
Question 6 (1 point) What does quality mean with respect to project management? Question 6 options: Meeting management expectations The degree of conformance to project requirements Meeting or exceeding customer expectations Staying within planned limits for the triple constraints Question 7 (1 point) You are managing a project and have created a list of issues and you have rank ordered them in terms of rate of occurrence. What technique or tool have you used? Question 7 options: Scatter diagram Pareto...
Unit6: OPTIMIZING AND CONTROLLING PROCESSES THROUGH STATISTICAL
PROCESS CONTROL
1. Define the concept of statistical process control SPC?
2. What is SPC key element?
3. Solving the following problem (Using x -charts and R
–charts)?
a. Using this data to solve the problem by using X bar chart and
R chart?
b. What is the difference between X bar chart and R chart?
c. Draw the control chart for both X bar chart and R chart?
d. Explain the result?...
A statistical process control chart example. Samples of 25 parts from a metal punching process are selected every hour. Typically, 1% of the parts require rework. Let X denote the number of parts in the sample of 25 that require rework. A process problem is suspected if X exceeds its mean by more than three standard deviations Round your answers to four decimal places (a) If the percentage of parts that require rework remains at 1%, what is the probability...
Control charts for bar x chart and S have been maintained on a process and have exhibited statistical control. The sample size is n=6. The control chart parameters are as follows: Estimate the mean and standard deviation of the process. Assume that the process output is well modeled by a normal distribution. If specifications are 703 and 709, estimate the fraction nonconforming. Suppose the process mean shifts to 702.00 while the standard deviation remains constant. What is the probability of...
Problem no.3 The thickness of a metal part is the quality characteristic that statistical process control is being applied to. Measurements are taken from 25 subgroups of subgroup size 5. The sum of the X-bar values 1.5735. The sum of the R-values .0231. Xbar/R Chart for x 0636 06396 Subgroup 10 15 20 25 001 0011 a.) Calculate the trial control limits and centerlines for the X-bar and R charts above b.) Calculate the revised control limits and centerlines for...
Examine the Statistical Process Control outputs below. If the sample size is 3, What are the UCL and LCL, respectively, for this X-bar chart? Hour X-BAR R 1 3 2 2 5 1 3 4 4 4 2 1 Select one: O a. 4.654 and 2.346 O b. 4.958 and 2.042 O c. 7.26 and -0.26 O d. 5.546 and 1.454 e. Right answer is not listed
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