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Unformatted text preview: MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Civil and Environmental Engineering 1.017 Computing and Data Analysis for Environmental Applications Quiz 3 Tuesday, December 10, 2002 Please answer all questions on a separate piece(s) of paper with your name clearly identified: Problem 1 ( 15 points) A field survey attempts to relate nitrogen runoff (in 1000 kg/year) in a small watershed to 2 factors: A) pesticide use (none, light, moderate, or heavy) and B) soil type (sandy, sand-silt, silty clay, or clay). Answer the following questions about the two-way ANOVA table given below: Source SS df MS=SS/df F p Factor A 0.0403 3 0.0134 0.6992 0.5661 Factor B 0.3044 3 0.1015 5.2856 0.0100 Interaction AB 0.3265 9 0.0363 1.8896 0.1278 Error 0.3072 16 0.0192 Total 0.9783 31 1. Which, if any, of the two factors contributes significantly to nitrogen runoff? Why? 2. Are interactions between factors A and B significant? Why? Problem 2 ( 15 points) Species diversity indices are frequently used to measure the health of natural ecosystems. Suppose that you are given the following two sets of unitless diversity indices for a control site and a site affected by human activity: Control: 2.72 1.98 8.13 0.42 4.17 6.66 Affected: 2.78 3.02 0.93 3.21 Use the normal probability plot provided at the end of this quiz to determine the...
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This note was uploaded on 11/29/2011 for the course CIVIL 1.00 taught by Professor Georgekocur during the Spring '05 term at MIT.

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