Quality management 385

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4. A random sample of 200 printed circuit boards contains 18 defective or nonconforming units.

Estimate the process fraction nonconforming. Using a 90% two-sided confidence interval,

evaluate whether or not it is possible that the true fraction nonconforming in this process is 10%.

5. During shipment testing, product was flown from Indianapolis to Seattle and back again to simulate 4 takeoffs

and landings which can cause cans to open due to pressure changes.

Prototype units of the 100 were shipped and 15 opened. Using a 90% two-sided confidence interval,

determine if it is possible that the average failure rate is 11%