SP05.final.verB

# SP05.final.verB - COURSE: DSCI 3710 Print Name: Final Exam...

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Use the information given below to answer the two questions (2) that follow: The production manager in a chemical plant knows that the time for a certain production line to stabilize, following any stoppage (stabilization period) is normally distributed. He uses a sample of 15 random stoppages to determine a 90% confidence interval for the true mean stabilization period to be 8.1 to 9.5 minutes. The firm = s cost accountant would like to answer the following question: “Is there sufficient evidence, at the 10% significance level, to indicate that the average stabilization period is different from 8 minutes?” 1. What should be the decision and conclusion based on the confidence interval? . Reject the null hypothesis, conclude that there is evidence the true mean stabilization period is not equal to 8 minutes. * . Fail to reject the null hypothesis, conclude that there is insufficient evidence the true mean stabilization period is not equal to 8 minutes. . Fail to reject the null hypothesis, conclude that there is insufficient evidence the true mean stabilization period is equal to 8.8 minutes. . Reject the null hypothesis, conclude that the true mean stabilization period is 8.8 minutes. . There is insufficient information given to decide whether the true mean stabilization period is equal to 8 minutes or not. 2.
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## This note was uploaded on 03/09/2011 for the course DSCI 3710 taught by Professor Dr.jay during the Spring '08 term at North Texas.

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SP05.final.verB - COURSE: DSCI 3710 Print Name: Final Exam...

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