ASQ Six Sigma Black Belt Exam Practice Test

A set of data from a process has 8 readings per sample and 50 samples. The mean of the 50 sample means is 12.62. The mean of the 50 ranges is 0.18.Find the control limits for a median chart.

Here is a partial ANOVA table. Use = 0.05.

The values of x, y and z should be:

An x-bar and R chart is used to monitor a process. One week ago a new type of raw material was introduced and since that time 60 points have been plotted on the xbar chart and all are in the middle third of the chart. The corresponding 60 points on the R chart are all below the average range. This indicates that:

The average number of defects is 21.6. Find the upper control limit for the c-chart.

An indication of the experimental error is available because the design has:

An experiment is conducted by checking the effect that three different pressures have on the surface appearance of a product. Ten items are produced at each of the three pressures. The number of replications, factors and levels are:

A complex system has many causes and effects. These may be illustrated on which of the following: