# MGT 305 MGT305 Module 4 Check Your Understanding Answers (AAU Online)

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1.Describe the difference between chance and assignable causes.

2.How would you use variation to manage a group of people?  Why should a manager be aware of assignable and chance causes?

3.What is meant by the statement, “The process is in a state of statistical control”?

4.Describe how both an X and R or s chart would look if they were under normal statistical control.

5.Why is the use and interpretation of an R or s chart so critical when examining an X chart?

6.X charts describe the accuracy of a process and R and s charts describe the precision.  How would accuracy be recognized on an X chart?  How would precision be recognized on either an R or s chart?

7.Create an X and R chart for the clutch plate information in Table 5.1 in Chapter 5.  You will need to calculate the range values for each subgroup.  Calculate the control limits and centerline for each chart.  Graph the data with the calculated values.  Beginning with the R chart, how does the process look?

8.Create an X and s chart for the clutch plate information in Table 5.1 in Chapter 5.  You will need to calculate the standard deviation values for each subgroup.  Calculate the control limits and centerline for each chart.  Graph the data.  Beginning with the s chart, how does the process look?

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