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Devry BSOP326 week 3 checkpoint

Question 1.1. TCO 11) A standard deviation is a _____. (Points : 2)


descriptive statistic


inference statistic

Question 2.2. TCO 11) An arbitrary sample of pertinent data is a _____. (Points : 2)

judgment sample

simple random sample

systematic sample

stratified sample

Question 3.3. (TCO 11) The sampling method in which every item in the population has an equal probability of being selected is called which of the following? (Points : 2)

Simple random sampling

Stratified sampling

Systematic sampling

Judgment sampling

Question 4.4. (TCO 11) Samples are selected to obtain data about the characteristics of _____. (Points : 2)

an experiment


a population


Question 5.5. (TCO 11) A system governed only by common cause variation is a system that exhibits which of the following? (Points : 2)

It is highly productive

In control

It meets a customer’s quality specifications.

It has zero natural variation.

Question 6.6. (TCO 12) Which of the following tools is used to identify and isolate causes of a problem? (Points : 2)

Shewart diagram

Scatter diagram

Cause-and-effect diagram


Question 7.7. (TCO 12) Another name for a cause-and-effect diagram is which of the following? (Points : 2)


Run chart

Check sheet

Fishbone diagram

Question 8.8. (TCO 12) SPC allows workers to separate the _____ causes of variation from natural causes. (Points : 2)





Question 9.9. (TCO 12) Which of the following charts is used to monitor the total number of defects per unit when a constant subgroup size is employed? (Points : 2)





Question 10.10. (TCO 12) A bank observes that most customer complaints come from only a small subset of its total customer base. This is an example of which of the following? (Points : 2)

Clustering analysis

The Pareto principle

Data skewing

The central limit theorem

Question 11.11. (TCO 12) Determine the sample standard deviation(s) for the following data: 7, 8, 2, 1, 3, and 5. (Points : 5)

s = 2.805

s = 3.266

s = 2.927

s = 3.578

Question 12.12. (TCO 12) Six samples of subgroup size 6 (n=6) were collected. Determine the upper control limit (UCL) for an X-Bar chart if the mean of the sample averages is 4.7 and mean of the sample ranges is 0.35. .

CHART (Points : 5)

UCL = 4.86905

UCL = 4.90195

UCL = 4.72250

UCL = 5.05805

Question 13.13. (TCO 12) Twenty samples of subgroup size of 5 (n = 5) were collected for a variable measurement. Determine the upper control limit (UCL) for an R-chart if the mean of the sample ranges equals 4.4.

TABLE (Points : 5)

UCL = 9.3060

UCL = 1.4695

UCL = 11.3256

UCL = 8.8176

Page 2

Question 1. 1. (TCO 11) Describe how a frequency distribution relates to process variability. (Points : 5)

Question 2. 2. (TCO 11) From the standpoint of SPC, what does the standard deviation measure? (Points : 5)

Question 3. 3. (TCO 11) Describe the purpose of a cause-and-effect diagram. (Points : 5)

Question 4. 4. (TCO 12) Explain the difference between Type I and Type II errors in the context of a control chart. Why is it important to give operators control over their processes? (Points : 5)

Question 5. 5. (TCO 12) Outline the basic steps for setting up a control chart to monitor a process and determine its process capability. (Points : 5)

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