Historically, the Average Proportion of Defective Bars Has Been 0

question 23

Multiple Choice

Historically, the average proportion of defective bars has been 0.015.Samples of 100 bars each are taken.Construct a p-chart using z = 3.Suppose a sample had 0.044 defectives.What would you do?

• A)Nothing; it appears to be random variation.
• B)Look for assignable causes.
• C)Delete the sample with 0.044 defects and take another sample that is better.
• D)None of these choices