Discussion
X bar charts discover assignable causes ........................ samples.
Answer: A
X bar charts discover assignable causes between samples.
An X-bar chart plots the mean of each sample taken from a process over time. A shift in the process mean, from tool wear, a new batch of material or a change of operator, makes sample means differ from one another and fall outside the control limits. It therefore detects variation between samples.
Variation within a sample, the spread among items taken at the same time, is monitored by the range (R) chart or the standard deviation chart, which is why X-bar and R charts are used together. 'Among' and 'inside' are not the standard terms.
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