# Ch 8,9 - 6.2 26 2.01 50 ± 28 is not reasonable because it...

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Answers to Assigned Exercises from Chapter 8 21. The difference between a sample statistic and the population parameter. Yes, the difference could be zero. The sample mean and the population parameter are equal. 22. 1. Destructive nature of some tests 2. Physically impossible to check all items 3. Costly to check all items 4. Time consuming to check all items 34. a. 40,000 5657 50 x s = = . b. The distribution will be normal c. 112,000 110,000 0.35 40,000 50 z - = = So probability is 0.3632, found by 0.5000 - 0.1368. d. 100,000 110,000 1.77 40,000 50 z - = = - So probability is 0.9616, found by 0.5000 + 0.4616. e. 0.5984, found by 0.4616 + 0.1368. Answers to Assigned Exercises from Chapter 9 32. a. 3.01 pounds b. 2.9999 and 3.0202 pounds, found by 3.01 2.03(0.03/ 36) ± About 95 percent of similarly constructed intervals would include the population mean. 34. Between 24.24 and 27.76, found by

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Unformatted text preview: 6.2 26 2.01 50 ± . 28 is not reasonable because it is outside of the confidence interval. 46. For the applicants the confidence interval is between 0.021 and 0.107, found by 0.064(1 0.064) 0.064 2.58 . 220 -± It would not be reasonable to conclude that more than ten percent of the applicants are now failing the test because 0.10 is inside the confidence interval. For the employees the confidence interval is between 0.011 and 0.059, found by 0.035(1 0.035) 0.035 2.58 . 400 -± Neither would it be reasonable to conclude that less than five percent of the employees are now failing the test because 0.05 is also inside the confidence interval...
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