In a Manufacturing Process a Random Sample of 9 Manufactured

question 112

Multiple Choice

In a manufacturing process a random sample of 9 manufactured bolts has a mean length of 3 inches with a standard deviation of .3 inches and is normally distributed. What is the 95 percent confidence interval for the true mean length of the manufactured bolt?

• A) 2.804 to 3.196
• B) 2.308 to 3.692
• C) 2.769 to 3.231
• D) 2.412 to 3.588
• E) 2.814 to 3.186

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