Which one of the following statements relating to quality is TRUE?
A)Sampling procedures based on measurement by variables should be used when quality specifications are complex.
B)A distribution of sample means has more variance than the process distribution itself.
C)The distribution of sample means can be approximated by the normal distribution.
D)Sampling is a better approach than 100 percent inspection when the cost of accepting a defective item is very high.

Question

Quizplus · Accepted Answer

The statement that the distribution of sample means can be approximated by the normal distribution is true. This is known as the central limit theorem and is a fundamental concept in statistical quality control. A is incorrect because sampling procedures based on measurement by variables should be used when quality specifications are not complex. B is incorrect because the distribution of sample means has less variance than the process distribution itself. D is incorrect because sampling and 100 percent inspection are both valid approaches, and the choice between them depends on several factors such as the cost of inspection, the cost of rework, and the criticality of quality. There is no general rule that sampling is always a better approach than 100 percent inspection when the cost of accepting a defective item is very high.

Which One of the Following Statements Relating to Quality Is