MECH 262 Lecture Notes - Lecture 1: Data Set, Seta, Frequency Distribution
23 May 2016
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Document Summary
Random features are observed in virtually all measurements. Even if the same measuring system is used to measure a fixed measurand repeatedly, the results will not all have the same value. Uncontrolled variables affecting the experiment lack of precision in the measurement process. Measurement of the temperature of hot gas flowing through a pipe. 60 temperature measurements over a period of 1 hour. To help us visualize the data, it is helpful to plot them in the form of a bar graph as shown. A bar graph of this type used for statistical analysis is called a histogram. Some other forms of distributions that may be found in engineering applications. (a) symmetric; (b) skewed; (c) j-shaped; (d) bimodal; (e) uniform. Measure of center: the value at the center or middle of a data set. The measure of center obtained by adding the values and dividing the total by the number of values x.
