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

A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are in control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results: 17 Machine Obs. #1 15 16 25 #3 23 24 23 Use the factor table to answer the following questions. #2 18 Size of Sample (n) Factor for UCL and LCL for X-Chart (A) Factor for LCL for R-Chart (0) 1.880 1.023 Factor for UCL for R-Chart (0) 3.267 2.575 2.282 2.115 2.004 1.924 0.729 0.577 0.483 0.419 0.076 0.373 0.136 1.864 0.337 0.184 1.816 1.777 0.308 0.223 Source: Reprinted with permission from ASTM Manual on Quality Control of Materials, copyright Harbor Drive, West Conshohocken, PA 19428 ASTM International, 100 Barr Question 24 (3.3 points) What is the mean of sample means? (Answer in a whole number.) Question 25 (3.3 points) What is the average of sample ranges? (Answer with two decimal point.)

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