Question: 3. Given the following data in microinches for the surface roughness of a grinding operation, construct a multivari chart and analyze the results. Time 0700
3. Given the following data in microinches for the surface roughness of a grinding operation, construct a multivari chart and analyze the results.

Time 0700 h 1400 h 2100 h Part No. 20 21 22 82 83 84 145 146 147 38 26 31 32 19 29 10 28 14 Surface 28 08 30 25 29 09 05 11 15 Roughness 30 31 38 16 20 18 26 38 04 Measure 37 20 22 22 21 16 32 30 38 39 44 35 30 28 24 29 38 10
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