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1. A chemist used a CRM for benzoic acid in mango juice with a concentration of 751.33 ppm for an analysis. The data from his analysis is as follows: 741.20 ppm, 742.82 ppm, 740.10 ppm and 745.81 ppm. a. Compute for the average, sd, SEM and CV b. Determine the accuracy of his analysis by computing for the absolute error and relative error.

1. A chemist used a CRM for benzoic acid in mango juice with a concentration of 751.33 ppm for an analysis. The data from his analysis is as follows: 741.20 ppm, 742.82 ppm, 740.10 ppm and 745.81 ppm. a. Compute for the average, sd, SEM and CV b. Determine the accuracy of his analysis by computing for the absolute error and relative error.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 1GP
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1. A chemist used a CRM for benzoic acid in mango juice with a concentration of 751.33 ppm for an analysis. The data from his analysis is as follows: 741.20 ppm, 742.82 ppm, 740.10 ppm and 745.81 ppm. a. Compute for the average, sd, SEM and CV b. Determine the accuracy of his analysis by computing for the absolute error and relative error. 2. Omega 3-fatty acid in replicate samples of cow milk was measured six times by each of two methods with the following results: Concentration of Omega 3 fatty acid in cow milk Method 1 using Gas chromatography Method 2 using titration 0.0278 % 0.0281 % 0.0281 % 0.0287 % 0.0279 % 0.0282 % 0.0279 % 0.0285 % 0.0281 % 0.0283 % 0.0282 % 0.0283 % a. Calculate for the average, standard deviation, SEM and CV of each method. b. Which method gave more precise results? c. Calculate the 99 % confidence interval of each method.
Transcribed Image Text:1. A chemist used a CRM for benzoic acid in mango juice with a concentration of 751.33 ppm for an analysis. The data from his analysis is as follows: 741.20 ppm, 742.82 ppm, 740.10 ppm and 745.81 ppm. a. Compute for the average, sd, SEM and CV b. Determine the accuracy of his analysis by computing for the absolute error and relative error. 2. Omega 3-fatty acid in replicate samples of cow milk was measured six times by each of two methods with the following results: Concentration of Omega 3 fatty acid in cow milk Method 1 using Gas chromatography Method 2 using titration 0.0278 % 0.0281 % 0.0281 % 0.0287 % 0.0279 % 0.0282 % 0.0279 % 0.0285 % 0.0281 % 0.0283 % 0.0282 % 0.0283 % a. Calculate for the average, standard deviation, SEM and CV of each method. b. Which method gave more precise results? c. Calculate the 99 % confidence interval of each method.
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