Canine Gourmet Super Breath dog treats are sold in boxes labeled with a net weight of 12 ounces (340grams) per box. Each box contains eight individual 1.5 ounce packets. To reduce the chances of shorting the customer, product design specifications call for the packet-filling process average to be set at 43.5 grams. Tolerances are set for the box to weigh 348+/-12 grams (plus or minus 12). The standard deviation for the packet-filling process is 1.01gram. The target process capability ratio is 1.33.
One day, the packet filling process average weight drifts down to 43.0 grams.
Is the packing process capable? Is an adjustment needed?
The capability ratio is defined as:
Cp = upper specification limit - lower specification limit
6 * (standard deviation)
This is the same ...