In a Manufacturing Process a Random Sample of 9 Bolts

question 40

Multiple Choice

In a manufacturing process a random sample of 9 bolts manufactured has a mean length of 3 inches with a variance of .09.What is the 90% confidence interval for the true mean length of the bolt?

• A)2.8355 to 3.1645
• B)2.5065 to 3.4935
• C)2.4420 to 3.5580
• D)2.8140 to 3.8160
• E)2.9442 to 3.0558

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