Determine the upper and lower control limits

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Reference no: EM132168324

Maid

Sample 1

Sample 2

Sample 3

Alex

122

90

152

Marie

130

111

140

Linda

200

180

175

Ann

163

155

141

(i) Determine the upper and lower control limits for an X-Bar chart and R-chart with a sample size of four.

(ii) After the control chart was established a sample of four observations had the following times in seconds: 189, 198, 193, and 220. Is corrective action needed?

Reference no: EM132168324

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