L3 - Chemistry 5 Lecture 3 Reading Assignment: Chapters...

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Chemistry 5 January 30, 2008 Lecture 3 Reading Assignment: Chapters 9-11 Statistical Analysis of Data II a) Confidence interval: the idea and examples with 95% confidence: 1.96 i x μ σ 1.96 () xN N if the population standard deviation σ is not known: ts N where Student's t parameter depends on the selection of the confidence level and degrees of freedom (N-1) b) To assess accuracy of a technique, we can compare an experimental mean with a known μ: if μ lies outside the confidence interval of the mean ts N ± , or 1.96 N ± , we can say with the chosen certainty that the mean is significantly different than the true value. If μ lies inside the confidence interval of the mean we cannot say that the technique is inaccurate . (Clearly in the latter case it would be wrong to say with that level of certainty that the technique is accurate. These statements can only refer to the difference between μ and
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This note was uploaded on 02/04/2010 for the course CHEM 15 taught by Professor Staff during the Fall '08 term at University of California, Berkeley.

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L3 - Chemistry 5 Lecture 3 Reading Assignment: Chapters...

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