CEE 110 PS6 11 Examples

# CEE 110 PS6 11 Examples - UNIVERSITY OF CALIFORNIA LOS...

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UNIVERSITY OF CALIFORNIA, LOS ANGELES Civil and Environmental Engineering Department CEE 110 Introduction to Probability and Statistics for Engineers Spring Quarter 2011 MW 12-4 PM Frnz 1178 Prof. K. D. Stolzenbach 5732J Boelter Hall, 206-7624 [email protected] Problem Set 6 Examples _____________________________________________________________________________ Note: in doing the problems involving the t-test, you can use the following web site: http://www.stat.ucla.edu/~dinov/courses_students.dir/Applets.dir/Normal_T_Chi2_F_Tables.htm 1. [P = 0.0008] 2. [P = 0.0071] 3. [P = 0.202; P = 0.0157]

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4. [P = 0.1635] 5. [P = 0.0207] 6. [P = 0.204]
7. [P = 0.0195] 8. In a certain area, regulations require that the chlorine level in wastewater discharges be less than 100 μ g/L. In a sample of 85 wastewater specimens, the mean chlorine concentration was 98 μ g/L and the standard deviation was 20 μ g/L. Let μ represent the mean chlorine level. A test is made of versus . a) Find the P- value. [P=0.1788] b) Do you believe it is plausible that the mean chlorine concentration is greater than or equal to 100 μ g/L, or are you convinced that it is less? Explain your reasoning. 9. Incinerators can be a source of hazardous emissions into the atmosphere. Stack gas samples were collected from a sample of 50 incinerators in a major city. Of the 50 samples, only 18 met environmental standard for the concentration of a hazardous

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## This note was uploaded on 10/22/2011 for the course ENG 101 taught by Professor Yukov during the Spring '11 term at UCLA.

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CEE 110 PS6 11 Examples - UNIVERSITY OF CALIFORNIA LOS...

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