Chem-3000-Prelabs-Fall-2009-Prelab-2c

Chem-3000-Prelabs-Fall-2009-Prelab-2c - 78.40 78.21 77.91...

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PRE-LABORATORY EXERCISES 5 Experiment 2 Day 3 Prelab Last ________________________________ First _____________________ Email: ___________________@ cornell.edu [ ] Christina Cowman [ ] Yingchao (Alex) Yu [ ] Angela Bruneau [ ] Mon PM [ ] Tues AM [ ] Tues PM [ ] Weds PM [ ] Thurs PM Mona and co-workers studied the use of radioactive isotopes as a means of data sediments collected from the bottom of lakes and estuaries. 1 To verify this method, they analyzed a 208 Po standard known to have an activity of 77.87 decays/min, obtaining the following results. 77.46 72.79 77.21 75.74 75.13 77.06
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Unformatted text preview: 78.40 78.21 77.91 76.12 81.49 76.46 Determine whether there is a signicant difference between the mean and the expected value at 95% signicance. Show your work. mean = x 12 = _______________ standard deviation = s 12 = _______________ t exp = _______________ t crit = _______________ check one: the difference is ______ is not ______ signicant 1 Problem adapted from Harvey, problem 4.19. Cornell University Chemistry 3000 Fall 2009 J. A. Marohn...
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