The time to make beds at a motel should fall into an agreed on range of times A sample of four maids was selected, and the time needed to make a bed was observed on three different occasions Service time in seconds 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 180, 219, 195, and 195 Is corrective action needed

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Question: The time to make beds at a motel should fall into an agreed-on range of times. A sample of four maids was selected, and the

The time to make beds at a motel should fall into an agreed-on range of times. A sample of four maids was selected, and the time needed to make a bed was observed on three different occasions:

Service time in seconds

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: 180, 219, 195, and 195. Is corrective action needed?

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