STATISTICAL QUALITY CONTROL
Quality control
is a part of quality management (ISO 9000:2005) focused on the fulfillment of
quality requirements. It is a systematic process to monitor and improve the
quality of a product, e. g., a manufactured article, or service by achieving
the quality of the production process and the production plant.
Statistica1 quality control (SQC) is the
term used to describe the set of statistical tools used by quality professionals.
Statistical quality control can be divided into three broad categories:
1. Descriptive
statistics are used to describe quality characteristics and relationships.
Included are statistics such as the mean, standard deviation, the range, and a
measure of the distribution of data.
2. Statistical
process control (SPC) involves inspecting a random sample of the output
from a process and deciding whether the process is producing products with
characteristics that fall within a predetermined range. SPC answers the
question of whether the process is functioning properly or not.
3. Acceptance
sampling is the process of randomly inspecting a sample of goods and
deciding whether to accept the entire lot based on the results. Acceptance
sampling determines whether a batch of goods should be accepted or rejected.
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