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CHEM 2480 (1)
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Problem Set 2 solutions.pdf

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Department
Chemistry
Course
CHEM 2480
Professor
Jamieson
Semester
Fall

Description
CHEM 2400/2480 Solutions for Problem Set 2: Statistics, error analysis and standard curves 1. The following 10 results are from experimental measurements for the atomic weight of carbon: 12.0112, 12.0210, 12.0102, 12.0118, 12.0111, 12.0106, 12.0113, 12.0101, 12.0097, 12.0095 Calculate the mean, the average deviation from the mean, and the standard deviation for these results. Can the outlying point be justifiably rejected? If so, re-calculate an improved value for the mean and the standard deviation. mean deviation from the mean standard deviation, outlying pt: Qcrit = 0.41 at 90% confidence level since Qexp > Qcrit, reject value, (also at 99%)! new mean 12.0106, new standard deviation 0.0008 CHEM 2400/2480 2. Calculate the value of the function F and its standard deviation for F defined as: a. F = X + Y - Z (Ans. -7 ± 4) b. F = 2X + 3Y - 3Z (Ans. -20 ± 10) c. F = X/(Y + Z) (Ans. 0.08 ± 0.03) d. F = 10X - (7Y/Z) (Ans. 9 ± 1) 2 e. F = XY/(Z ) 2 (Ans. 0.02 ± 0.01) f. F = (X + Y )/Z (Ans. -7 ± 4) In each case: X = 1.0 ± 0.1; Y = 2.0 ± 0.5; Z = 10 ± 4 a. F = X + Y - Z = 1.0 + 2.0 - 10 = -7.0 b. F = 2X + 3Y - 3Z = -22 c. CHEM 2400/
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