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EG 10111: Introduction to Engineering
Module 1, Homework 3
Due in Learning Center, Week of September 19, 2011
Reading: Brockman, Sections 2.2.1-2.2.3
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1.Communicating the Results of an ExperimentIn last week’s learning center, each group programmed a vehicle to travel one meter in a straight line by counting the revolutions of the driving wheel. Although each robot was programmed the same way, the results that we obtained for actual driving distance varied. The average driving distances from everyone’s sets of three trials are available on Concourse under this week’s homework assignment, in a file called DrivingDistances.csv. This is just a set of distances (in meters) listed on separate lines, which can be opened with any text editor/Microsoft Office. (a)Construct a bar chart (in this case, also called a histogram) to visually display the results of all of our trials. To do this, you should count the number of trials that fall into the ranges below, then plot the ranges on the X-axis and the count (frequency) on the Y-axis. You may choose to either plot this neatlyby hand (using a ruler and/or graph paper) or electronically (using a program like Excel or MATLAB).
(b)The average value of our data is .0999 meters. Determine the percentage of trials that lie within 0.072 meters of this value; that is, the percentage of trials whose distances are between 0.938 and 1.060 m. (c)Determine the percentage of trials whose distances are between 0.876 and 1.122 m. (d)Explain one way in which our program/experiment could be modified in order to get more trial distances closer to exactly 1.00 meters.

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