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카테고리 : 레포트 > 공학,기술계열 파일이름 :공업통계학 principles of.hwp 문서분량 : 7 page 등록인 : repojaehoon 문서뷰어 : 
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공업통계학 principles of statistics for engineers and scientists 연습문제 풀...
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- 보고서설명
- 공업통계학 principles of statistics for engineers and scientists 5.2 5.3 5.4 5.5 장 연습문제 풀이
5.2
9. In a sample of 80 ten-penny nails, the average weight was 1.56g, and the standard deviation was 0.1g.
10. One step in the manufacture of a certain metal clamp involves the drilling of four holes. In a sample of 150 clamps, the average time needed to complete this step was 72 seconds and the standard deviation was 10 seconds.
5.3
2. During a recent drought, a water utility in a certain town sampled 100 residential water bills and found that 73 of the residences had reduced their water consumption over that of the previous year.
13. For major environmental remediation projects to be successful, they must have public support. The article “Modelling the Non-Market Environmental Costs and Benefits of Biodiversity Using Contingent Value Data” (D, Macmillan, E. Duff, and D. Elston, Environmental and Resource Economics, 2001:391-410) reported the results of a survey in which Scot
- 본문일부/목차
- 공업통계학 principles of statistics for engineers and scientists 5.2 5.3 5.4 5.5 장 연습문제 풀이
5.2
9. In a sample of 80 ten-penny nails, the average weight was 1.56g, and the standard deviation was 0.1g.
10. One step in the manufacture of a certain metal clamp involves the drilling of four holes. In a sample of 150 clamps, the average time needed to complete this step was 72 seconds and the standard deviation was 10 seconds.
5.3
2. During a recent drought, a water utility in a certain town sampled 100 residential water bills and found that 73 of the residences had reduced their water consumption over that of the previous year.
13. For major environmental remediation projects to be successful, they must have public support. The article “Modelling the Non-Market Environmental Costs and Benefits of Biodiversity Using Contingent Value Data” (D, Macmillan, E. Duff, and D. Elston, Environmental and Resource Economics, 2001:391-410) reported the results of a survey in which Scottish voters were asked whether they would be willing to pay additional taxes in order to restore the Affric forest. Out of 189 who responded, 61 said they would be willing to pay.
5.4
6. A chemist made eight independent measurements of the melting point of tungsten. She obtained a sample mean of 3410.14ºC and a sample standard deviation of 1.018ºC.
9. The article “Ozone for Removal of Acute Toxicity from Logyard Run-off” (M. Zenaitis and S. Duff, 2002:83-90) presents chemical analyses of runoff water from sawmills in British Columbia. Included were measurements of pH for six water specimens: 5.9, 5.0, 6.5, 5.6, 5.9, 6.5. Assuming these to be a random sample of water specimens from an approximately normal population, find a 95% confidence interval for the mean pH.
5.5
3. The article “Ozone for Removal of Acute Toxicity from Logyard Run-off” (M. Zenaitis and S. Duff, 2002:83-90) presents chemical analyses of runoff water from sawmills in British Columbia. Included were measurements of pH for six water specimens: 5.9, 5.0, 6.5, 5.6, 5.9, 6.5. Assume that these are a random sample of water specimens from a normal population. These data also appear in Exercise 9 in Section 5.4.
SA
2. In a sample of 150 boards of certain grade, the average modulus of elasticity was 1.57 psi, and the standard deviation was 0.23 psi.
9. A random sample of 400 electronic components manufactured by a certain process are tested, and 30 are found to be defective.
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