Periodically, a sample of 20 items are randomly selected from a population that is normally distributed, the average is computed, and plotted. Which of the following statements is correct?
. The average of the logarithms of the values is lognormally distributed.
. The standard deviation of the averages is equal to the standard deviation of the individuals divided by the square root of 20.
. The variance of the averages is equal to the variance of the individuals divided by the square root of 20.

What is the standard deviation of the values below?
4.5, 5.1, 6.2, 2.1, 3.9

As a commonly used problem solving technique, which of the following would be the BEST application of a Pareto chart?
. To determine when to make proactive adjustments to a process.
. To differentiate between major and minor problem areas.
. To gather data and to design experimental controlled changes.
. To evaluate the results of other problem solving techniques upon the product or service.

Analysis of data on all product returns is important because
I. Failure rates change with length of product usage.
II. Changes in design and in customer use are often well reflected.
III. Immediate feedback and analysis of product performance becomes available.

Consider the following statement:
"A defect which might affect the appearance or general function of essential parts" This definition describes a seriousness classification described as