Chemistry 155 Introduction to Instrumental Analytical Chemistry
Chemistry 155 Introduction to Instrumental Analytical Chemistry
Chemistry 155 Introduction to Instrumental Analytical Chemistry
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Chem <strong>155</strong> Unit 1 Page 18 of 313An example:Assume that we do our best <strong>to</strong> measure the concentration of basicamines in a fish tank. Our answers are 4.2, 4.6, 4.0.N =3X AVG =(4.2+4.6+4.0) / 3 = 4.27s =(4.2-4.27) 2 +(4.6-4.27) 2 +(4.0-4.27) 23-1= 0.31Number of degrees of freedom for confidence interval =3-1=295% confidence limits for μ =5.45.04.27± (4.3*0.31) / (3 1/2 )= 4.27±0.93 or= 4.3 ± 0.9 or= 34<strong>to</strong>524.53.5Page 18 of 313
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