HW#6_sol_f08 - CE 3102 Fall 2008 Homework#6 Due 9:45 AM...

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CE 3102 Fall 2008 Homework #6 Due: 9:45 AM Tuesday, November 4, 2008 This is a team assignment. You may work together in teams of up to, but not exceeding, three people. Only one written submission is required from each team. However, every team member is responsible for knowing all of the material. 1. Retrieve the text file highlandwb.dat from the class web page. This file contains 120 individual vehicle speed measurements (in miles/hour), made on westbound Highland Ave, in St. Paul. (a) compute the average and standard deviation for this set of speeds, and use a histogram to display its frequency distribution. (b) Divide the 120 measurements into 24 non-overlapping groups of 5 measurements each. E.g. the first 5 measured speeds could be group 1, the second 5 could be group 2, and so forth. For each group, compute its average. Now, treating this set of 24 averages as a data set, compute its average and standard deviation, and display its frequency distribution using a histogram. (c) Compare and interpret the results in (a) and (b), using the notions of ‘population’, ‘sample’ ‘estimator’, ‘estimate’, and ‘bias’.
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