Which of the following statements is true?
A) For a variables control chart, n should be fairly large, frequently 50-300 observations.
B) For an attribute control chart, n is typically 5-10 observations, and rarely larger than 24.
C) For an attribute control chart, n should be large enough to include at least one defective unit.
D) None of the above.

Question

Quizplus · Accepted Answer

Attribute charts need large sample sizes (50 - 300 is common) and, as a general rule, the sample must be large enough to allow for the detection of at least one defective unit.
**Note: The following problem, #44, requires supplying a listing of control chart constants, such as the one provided in Table 9.1. Properly using the control chart constants is part of the problem.

Which of the Following Statements Is True