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3710Fall05finalA

# 3710Fall05finalA - COURSE DSCI 3710 Print Name Final Exam...

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Note: Whenever question(s) are connected you may be asked to assume a result (given a value) for some previous question/s; but this result may or may not be correct. The process is to prevent you from losing points on subsequent question/s because you made a mistake on some previous question/s. 2
Use the information given below to answer the four (4) questions that follow: A quality engineer wants to verify that the thickness of metal strips produced in their rolling mills is 6 centimeters. The consistency of their thickness is very important to the companies purchasing these strips, for down-stream processing. The engineer drew a sample of 70 strips, and obtained the average sample thickness as 5.835, and the sample standard deviation as 1.23. Test the appropriate hypothesis at the 1% significance level. 1. What is the calculated value of the test statistic? A. .−0.165 B. –0.1342 C. 2.36 D. 1.01 E. – 1.12 * 2. At the 1% level of significance, where is the Reject Ho region? A. To the left of Z = -1.282 and to the right of Z = 1.282 B. To the left of Z = -1.645 and to the right of Z = 1.645 C. To the left of t = -1.328 and to the right of t = 1.328 D. To the right of Z = -2.576 and to the left of Z = 2.576 E. To the left of Z = -2.576 and to the right of Z = 2.576* 3. Assuming the calculated value of the test statistic is 3.00, what are the decision and conclusion of the test at the significance level of 0.01 ? A. Fail to reject the null hypothesis, conclude there is insufficient evidence that the thickness of the metal strips is not 6 centimeters. B. Reject the null hypothesis, conclude there is evidence that the thickness of the metal

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• Spring '08
• Dr.Jay
• Null hypothesis, Statistical hypothesis testing, insufficient evidence, A. Reject Ho, preferred game category

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3710Fall05finalA - COURSE DSCI 3710 Print Name Final Exam...

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