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Practice Problems Confidence Interval

# Practice Problems Confidence Interval - Sample Exam...

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Sample Exam Questions Questions on Confidence Interval Use the information given below to answer the next question. The production manager in a chemical plant knows that the time for a certain product line to become stable after being stopped for machine adjustments is normally distributed. He uses a sample of 25 stoppages to determine a 95% confidence interval for the average warm-up period to be 11.3 to 19.7 minutes. The firm’s cost accountant would like to answer the following question: Is there sufficient evidence, at the 5% significance level, to indicate that the average warm- up period is different from 15 minutes? 1. What should be the decision and conclusion based on the confidence interval? A. Reject the null hypothesis, conclude that there is evidence the average warm-up period is equal to 15.5 minutes. B. Fail to reject the null hypothesis, conclude that there is insufficient evidence the average warm-up period is equal to15 minutes. C. Fail to reject the null hypothesis, conclude that there is insufficient evidence the

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Practice Problems Confidence Interval - Sample Exam...

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