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Unformatted text preview: Dr. Ole Mols, Chemistry Lab 1 The Penny Lab, Excel Page 1 Gong Cheng, Chem 120-2936; 2/03/10 Reference: Chemistry 120 Experiments , Diablo Valley College, 2010. “ 1982 Lincoln Memorial Cents ”, thefuntimesguide.com, <http://coins.thefuntimesguide.com/2008/09/lincoln_memorial_cent.php > Summary Abstract: The purpose of this lab is to get students used to the concepts of errors and standard deviation by measuring the mass of five pennies from two different time sets and to determine if whether the two sets of pennies are of the same population. The methods of using an analytical balance, calculation the standard deviation, coefficient of variance have been used. And my major result is that the two sets of pennies are not the same population. Results: I used the analytical balance to weigh the mass of pennies made after 1982 and calculated the average to be 2.4819g. Then I calculated the standard deviation by using the formula: 2 1/2 ( ) ( ) 1 i x x n σ- =- , which turned out to be 2...
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