Which table should be used to determine a confidence interval on the mean when standard deviation is NOT known and the sample size is 10?
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.
The distribution of a characteristic is negatively skewed. The sampling distribution of the mean for large samples is:
A comprehensive corrective action program is initiated at a large company. Input for CARs are received from customers, internal and external audits, material review reports and other sources. Which two of the following groups would usually administer and control the CAR process?
I. Management review team.
II. Quality department.
III. Corrective Action Board.
IV. Material Review Board.
Four ingredients are blended to make a final product. Using the data below, what is the expected weight and variation of the final product?
Ingredient A 70 ± 3.00 grams
Ingredient B 20 ± 1.73 grams
Ingredient C 15 ± 1.73 grams
Ingredient D 10 ±- 1.00 grams
