Assignment 1

Assignment 1 - γ and f c ’ . Determine the quartiles of...

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CE93-Engineering Data Analysis Mark Hansen, Fall 2009 Homework 1. Graphical Representation of Data Due 9/8/2009 9:10AM Data E1_2.dat on the course website, taken from Ref. 1, lists the measured densities (in kg/m 3 ) and the 28-day compressive strengths (in N/mm 2 ) of 40 concrete cubes. Let γ denote the density and f c denote the corresponding compressive strength. (These are the conventional notations used in engineering for these quantities). Using MATLAB, prepare the following graphs for these data: 1. Histograms, frequency diagrams, normalized frequency diagrams and normalized frequency polygons for γ and f c . Try experimenting with different numbers of equal or unequal bins. Present what you think are the best results. Comment on the range, dispersion and skewness of the sample distributions. 2. Cumulative frequency diagrams of
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Unformatted text preview: γ and f c ’ . Determine the quartiles of each variable, the interquartile range, and the quantiles at 0.1 and 0.9 cumulative frequencies. 3. Box plots of γ and f c ’ . Are there any outliers in the data? Do you observe any asymmetry in the distribution of either sample? 4. Scatter plot of f c ’ versus γ . Do you think these two variables are dependent? Describe the nature of the dependence if you observe it. 5. Q-Q plot of f c ’ versus γ . Do you think these two samples have similar distributions? You may submit your homework either by turning in a hard copy or by uploading a word or pdf file to bSpace. Reference [1] Kottegoda, N.T., and R. Rosso (1997). Probability, statistics, and reliability for civil and environmental engineers . McGraw-Hill, NY, New York....
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This note was uploaded on 09/19/2011 for the course CE 93 taught by Professor Hansen during the Fall '10 term at Berkeley.

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