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

Construct an -chart in conjunction with an R-chart using 3σ limits for the deliveryprocess.

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Sample Delivery Time (days) 10 12