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Unformatted text preview: Math Statistics MATH 203 Student: Nicholas Nishikawa Student Number: 260316198 Professor: David Wolfson Assignment #1 1) pg. 46, 2.29 a) By adding the percentages of aftershocks with intensity between 2.5 and 3.5 I estimated that the percentage of aftershocks between 1.5 and 2.5 on the Richter scale is approximately 68% of the 2,929 aftershocks. b) By adding the percentages after 3.0 on the Richter scale, I estimate that about 9% of the aftershocks are greater than 3.0. 2) pg. 48, 2.37 a) The graph is very roughly symmetrical around the value 5.5. There is a slight positive skew but it is roughly symmetrical. b) There are two observations that are unusually large (two at 14.5). There is one low value of 3.3. All other values are within one standard deviation of the mean. 3) pg.59, 2.59 Data (ammonia concentrations): 1.53 1.50 1.37 1.51 1.55 1.42 1.41 1.48 Data (ammonia concentrations) in Order from Lowest to Highest: 1.37 1.41 1.42 1.48 1.50 1.51 1.53 1.55 a) Determining the sample mean = 1 ? ¡ ? =1 = 1 8 ¡ 1.37 + 1.41 + 1.42 + 1.48 + 1.50 + 1.51 + 1.53 + 1.55 8 =1 = 1 8 (11.77) = 1.47125 b) The sample median for this data set is defined by the following equation: ? = 1.48 + 1.50 2 ? = 1.49 c) The sample mean for this data was 1.47125 this was skewed lower by the low observation of 1.37 which has an effect on bringing the average lower than the sample median of 1.49. This is 1....
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This note was uploaded on 06/23/2010 for the course MATH 203 taught by Professor Dr.josecorrea during the Spring '08 term at McGill.
 Spring '08
 Dr.JoseCorrea
 Statistics

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