All of the following statements about control charts are true except:

Related MCQs

• Statistical Process Control uses diagrams called "Control Charts." These charts depict horizontal, parallel lines to represent ______________ standard deviations.
• Trend charts reflect the relative status of a program. Trend charts are effective means of ______________.
• All of the following statements about acceptance sampling plans are true except:
• X bar charts are uses to control the ______________ of a process.
• Pattern in control charts which show the tendency to cluster around central line is termed as:
• Identify the charts which might give an indication of process going out of control (before the process has actually changed)
• When data is plotted on the control charts, the data is of two types: R and -bar. The R data represent points of a ______________ while the X-bar data represent points of a (n) ______________.
• Some organizations today are using "six sigma", to set the upper and lower limits on control charts rather than the traditional sigmas.
• Control chart theory is based on the differences of the causes of variations in quality. Variations in quality may be produced by assignable causes. All of the following are examples of assignable causes except:
• A project manager notices that all the measurements recorded on a control chart lie within the control band range. However, most of the measurements are below the midpoint (negative variance). Quality management practice offers us what guidance in dealing with this situation?