Question: 9) A quality engineer wants to construct a control chart for determining whether four machines, all producing the same product, are in control with regard

9) A quality engineer wants to construct a control chart for determining whether four machines, all producing the same product, are in control with regard to a particular quality variable. Accordingly, she sampled four units of output from each machine, with the following results:

Machine Measurements

#1 170 150 150 170

#2 160 250 180 250

#3 230 240 230 220

#4 170 200 180 210

What is the estimate of the grand mean (mean of mean, or x-double bar) of the sampling distribution for the sample mean?

  1. 160.0
  2. 177.5
  3. 197.5
  4. 210.0
  5. 230.0

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