Calculate the 95% confidence interval for these set of data:3.0, 3.4, 3.5, 3.2, 3.3 and 3.7 ppma. 3.35 ± 0.22 ppmDegrees ofFreedom80%90%95%99%99.9%b. 3.35±0.17 ppm13.086.3112.763.76371.892.924.309.9231.6c. 3.35 ± 0.25 ppm1.642.353.185.8412.91.532.132.784.608.61d. 3.35 ± 0.11 ppm1.482.022.574.036.871.441.942.452.363.715.96e. 3.35 ± 0.33 ppm71.421.903.505.412 3 456

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Calculate the 95% confidence interval for these set of data: 3.0, 3.4, 3.5, 3.2, 3.3 and 3.7 ppm a. 3.35 + 0.22 ppm Degrees of Freedom 80% 90% 95% 99% 99.9% b. 3.35 + 0.17 ppm 3.08 63.7 637 31.6 1 6.31 12.7 1.89 2.92 4.30 9.92 c. 3.35 ± 0.25 ppm 1.64 5.84 3 4 2.35 3.18 12.9 1.53 2.13 2.78 4.60 8.61 d. 3.35 ± 0.11 ppm 1.48 2.02 2.57 4.03 6.87 6. 1.44 1.94 2.45 2.36 5.96 5.41 3.71 e. 3.35 +0.33 ppm 7 1.42 1.90 3.50

Calculate the 95% confidence interval for these set of data: 3.0, 3.4, 3.5, 3.2, 3.3 and 3.7 ppm a. 3.35 + 0.22 ppm Degrees of Freedom 80% 90% 95% 99% 99.9% b. 3.35 + 0.17 ppm 3.08 63.7 637 31.6 1 6.31 12.7 1.89 2.92 4.30 9.92 c. 3.35 ± 0.25 ppm 1.64 5.84 3 4 2.35 3.18 12.9 1.53 2.13 2.78 4.60 8.61 d. 3.35 ± 0.11 ppm 1.48 2.02 2.57 4.03 6.87 6. 1.44 1.94 2.45 2.36 5.96 5.41 3.71 e. 3.35 +0.33 ppm 7 1.42 1.90 3.50

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter2: Basic Statistical Analysis With Excel

Section: Chapter Questions

Problem 12P

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A titrimetric method for the determination of calcium in limestone was tested by analysis of an NIST limestone containing 30.15% CaO. The mean result of four analyses was 30.26% CaO, with a standard deviation of 0.085%. By pooling data from several analyses, it was established that s   = 0.094% CaO.a. Do the data indicate the presence of a systematic error at the 95% confidence level?b. Do the data indicate the presence of systematic error at the 95% confidence level if no pooled value for s was available?
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Time left 0:55:27 Does the data set of 155.8, 158.4, 194.9, 164.8, 154.5, 184.3, 114.8 and 157.8 ppm contain outlier(s)? (Given that Qcrit.90 % confidence interval(n = 8) = 0.468) %3D %3D O 114.8 ppm is the outlier O All data should be retained O 194.9 ppm is the outlier O Both 114.8 and 194.9 ppm are outliers O t is difficult to judge
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A titrimetric method for the determination of calcium in limestone was tested with the analysis of a NIST limestone containing 30.15% CaO. The mean of the four analyzes is 30.26% CaO with a standard deviation of 0.085%. From the data accumulated from many analyzes, s→ϭ=0.094% CaO was found.a) Do the data indicate the presence of systematic error at the 95% confidence level?b) When a value for ϭ is unknown, do the data show a systematic error at the 95% confidence level?
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