1. 1

    What does the R stand for in the Xbar-R control chart?

  2. 2

    What is the constraint on the sample or subgroup size for creating an Xbar-R Chart?

  3. 3

    If you were a technical training center and you wanted to monitor the skills of your graduates from a welding class by randomly selecting 5 students from each class and evaluating the strength of a set of 15 sample welds done on 15 different materials, what chart would you use?

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