SP05.final.verB

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

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COURSE: DSCI 3710 Print Name: Final Exam Signature: Version B S.I.D.#: Spring 2005Seat Number: Note: Whenever question(s) are connected you may be asked to assume a result (given a value) from the previous question but this result may or may not be correct. This is to prevent you from losing points on a second question because you made a mistake on a previous question. Instructions: n Please print your name, student ID number, and seat number on this exam. Also, put your signature on this exam. l Please PRINT your name, this exam version (from above), and your seat number on your scantron. To better protect your privacy also print your name on the back side of your scantron. l You have 105 minutes to complete this exam. The exam is open book, open notes, and open mind. You may use any type of calculator, but please show all your work on this exam and mark all answers on the scantron . l Many of the questions follow the format of those in Hawkes Learning Systems: Business Statistics. Others are either based on the Excel assignments or use an Adventures-like approach with problems similar to those assigned as homework from the text. l Please DO NOT DETACH this exam. When you have completed the exam, please insert completed scantron into the exam booklet and turn them both to your instructor, at the front desk. l No cheating. l Good luck and we wish you well on the exam. 1
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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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