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2- A researcher took four samples, each with four observations, of the length of time (in minutes) for paint to dry. use this information

2- A researcher took four samples, each with four observations, of the length of time (in minutes) for paint to dry. use this information to obtain 3 sigma control limits for means of future times with 0.02 standard deviation. SAMPLE 1 2 3 4 Observation 1 12.49 12.15 12.09 12.12 2 12.16 12.19 12.09 12.10 3 12.11 12.20 12.11 12.08 4 12.18 12.21 12.15 12.10 Average ( X-bar) 12.16 12.19 12.11 12.10

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