The Great Outdoors Clothing Company, a mail-order catalogue operation, contracts with Purolator to deliver all of its orders to customers. As such, Great Outdoors considers Purolator to be part of its QMS program. Great Outdoors processes orders rapidly and requires Purolator to pick them up and deliver them rapidly. Great Outdoors tracks the delivery time for five randomly selected orders for 12 samples during a two-week period as follows:

Construct an x̅-chart in conjunction with an R-chart using 3σ limits for the delivery process.

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Sample Delivery Time (days) 3 3 3 2 3 3 3 2. 3 3 4 1 3 3 3 3. 2 1 2 10 6. 11 6. 1 12 1 3 2. 3. 3. 3. 3. 3. 3. 3. 2. 3. 4)