April 2024
Intermediate to advanced
824 pages
36h 45m
English
Content preview from Business Statistics
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Chapter 17 | Statistical Quality Control 643
17.6 CONTROL CHARTS FOR VARIABLES
Control charts for variables are based on the concept of normal distribution and are constructed on the
basis of sample means. These sample means are computed for a series of small random samples over
a period of time. These are based on the mean and standard deviation of the variable of interest.
17.6.1
x
Chart
x
chart is the chart of averages constructed by using sample means for a series of small random
samples over a period of time. In an
x
chart, these means are the average measurement of product
characteristics such as length, diameter, tensile strength of bearings, ...