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Chem. 275 Dr. Ng Chem 275 Statistical Test Class work / Homework Name: (please print) ______________________ PIN __________ o. Given: 86.50 0.24 at 95% confidence level Answer: The confident interval = ____________________ Answer: The confident limits = ____________ and __________________ 1. A soda ash sample is analyzed by titration with standard HCl. The analysis is performed in triplicate with the following results: 93.50, 93.58 and 93.43% Na2CO3. Within what range are you 95% confident that the true value lies? What are the confident limit? Answer: Confident range = ____________________ Confident limits = ____________ and __________________ 2. Given the following information: is there any significant difference between the 2 methods? Method A: S2 = 4.8, N =6, Method B: S2 = 8.3, N = 7 Answer: Ftabulated = ____________ at 95 % confidence level F calculated = ______________ at 95 % confidence level Conclusion : ___________________________ Chem. 27

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