Historically,the Average Proportion of Defective Bars Has Been 0

question 77

Multiple Choice

Historically,the average proportion of defective bars has been 0.015.Samples will be of 100 bars each.Construct a p-chart using z = 3.Suppose a sample had 0.07 defective.What would you do?

• A) Nothing; it is just random variation.
• B) Look for assignable causes.
• C) Change z to 2 and take another sample.
• D) Change z to 4 and continue sampling.

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