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In a manufacturing process, a random sample of 19 manufactured bolts has a mean length of 3.2 inches with a sample variance of 0.15. What

In a manufacturing process, a random sample of 19 manufactured bolts has a mean length of 3.2 inches with a sample variance of 0.15. What is the 80 percent confidence interval for the true mean length of the manufactured bolt? Select one: a. 2.769 to 3.231 b. 2.804 to 3.196 C. 2.308 to 3.692 d. 2.882 to 3.118

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