(Solution Library) A machine which manufactures a part for a car engine was observed over a period of time before a random sample of 400 parts was selected
Question: A machine which manufactures a part for a car engine was observed over a period of time before a random sample of 400 parts was selected from those produced by this machine. Out of 400 parts, 25 were defective. Find the sample mean of the proportion of defective parts.
- Find the sample standard deviation of the proportion of defective parts? Hint: Either a part is defective or it is not.
- What is the probability that the sample proportion will lie within 0.01 of the true population of defective parts?
Deliverable: Word Document 
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