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Unformatted text preview: patino (mp25752) – Postlab 2 – Lyon – (53385) 1 This printout should have 6 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 4.0 points Using the Qtest, determine whether there is an outlier in the following data set: 38.741, 37.160, 39.540, 40.555, 37.842, 34.052, 38.000, and 38.452. Discard the outlier if there is one, and then calculate the average and standard deviation to the correct number of significant figures. How would you report your results? 1. 38.613 ± 1.137 2. 38 ± 1 3. 38.61286 ± 1.13684 4. 39 ± 1 correct Explanation: 34.052 is separated from the other values, and its nearest neighbor is 37.160. Calculat ing Q according to the formula in Appendix 1 gives 0.48. There are 8 data points, so n=8. Since Q > 0.47 from the Qtable, the 34.052 data point should be thrown out. The average of the remaining points is 38.61286. The stan dard deviation of those data points is 1.13684. Round the standard deviation to one signifi cant digit (1) and round the average to that same decimal place (the ones place). 002 (part 1 of 2) 2.0 points Barium chloride, BaCl 2 , is soluble in water but is not reactive towards 3.0 M nitric acid. Barium sulfate, BaSO 4 , is not soluble in wa ter and does not react with 3.0 M nitric acid. Barium phosphate, Ba 3 (PO 4 ) 2 , is reactive to wards 3.0 M nitric acid but is not soluble in water....
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 Spring '09
 Lyon
 Barium, barium chloride, barium sulfate

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