What is meant by statistical quality control?

1.   ?    A collection of methods for ensuring statistics are of a suitable quality
2.   ?    A collection of methods for monitoring statisticians
3.   ?    A collection of methods for measuring, monitoring controlling and improving quality
4.   ?    A collection of methods for improving morale in the workplace

In Quality Control, what is meant by the term noise?

1.   ?    Random variation
2.   ?    Loud music
3.   ?    Out of control
4.   ?    Average

Which of the following is not usually part of a control chart?

1.   ?    Upper control limit
2.   ?    Centre line
3.   ?    Lower control limit
4.   ?    Out of control line

Which of the following is not usually used as an indication that a process is out of control?

1.   ?    8 consecutive points which steadily increase in magnitude
2.   ?    10 consecutive points above the centre line
3.   ?    A random pattern in the points
4.   ?    A cyclic pattern in the points

For large samples or measurements which are normally distributed, what is the probability that a sample mean lies outside the 3-sigma control limits when the process is in control?

1.   ?    0.0027
2.   ?    0.046
3.   ?    0.0013
4.   ?    0.3821

For large samples or measurements which are normally distributed, what is the probability that a sample mean lies outside the 2-sigma control limits when the process is in control?

1.   ?    0.0027
2.   ?    0.046
3.   ?    0.0013
4.   ?    0.3821

Which of the following is true when a process is in control.

1.   ?    all points lie within the control limits
2.   ?    the process includes variation due to special or assignable causes
3.   ?    the process includes a high percentage of satisfactory items
4.   ?    the process includes random variation

What is the name given to the chart drawn to monitor the variation in the process by using the ranges of the samples?

1.   ?    A bar chart
2.   ?    An R-chart
3.   ?    A pie chart
4.   ?    A p-chart

When a process is in control the proportion of satisfactory items is 95%. Samples of 50 items are taken every hour and the proportion of items in each sample which are satisfactory is observed. Calculate the 3-sigma lower control limit for the proportion of satisfactory items.

1.   ?    0.8575
2.   ?    0.7994
3.   ?    0.9126
4.   ?    0.8137

What is the ARL of a control chart?

1.   ?    The absolute residual limit
2.   ?    The arrival rate line
3.   ?    The actual range level
4.   ?    The average run length