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X bar charts discover assignable causes ........................ samples.

  • A.between
  • B.within
  • C.among
  • D.inside

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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