On public complaint that some gas cylinder supplied for...

On public complaint that some gas cylinder supplied for domestic use were underweight, and inquiry committee was set up. The committee decided to examine 1 in 40 cylinders from the 6,000 cylinders stored in a warehouse, arranged in rows by the gas company. The committee found 15 cylinders to be underweight from the 150 sampled cylinders.

A large paint retailer has had numerous complaints from their customers regarding underfilled paint cans. As a result, the retailer has begun inspecting incoming shipments of paint from suppliers. Shipments with underfill problems will be returned to the supplier. A recent shipment contained 2,440 cans. The retailer sampled 50 cans and weighed each on a scale capable of measuring weight to four decimal places. Properly filled cans need to weigh 10 kilogram; the average of the measured cans is 9,5 kilograms and the standard deviation is 0,3 kilograms. As the Quality Director of the company, describe the population, the variable of interest, the sample and the inference. If you are insisting that the process is filling the cans as planned, how much risk are you willing to take?

Kari H.

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