CEE 110 PS5 11 Examples

# CEE 110 PS5 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 12-2 PM Franz 1178 Prof. K. D. Stolzenbach 5732J Boelter Hall, 206-7624 [email protected] Problem Set 5 Examples _____________________________________________________________________________ 1. [1.533, 1.607; 1.517, 1.623; 89.04%; 509; 1045] 2. [0.490, 0.727; 0.863, 1; 0.572, 0.906]

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3. Note: use [5.303, 6.497] 4. In a random sample of 53 concrete specimens, the average porosity (in %) was 21.6 and the standard deviation was 3.2. a) Find a 90% confidence interval for the mean porosity of specimens of this type of concrete b) Find a 95% confidence interval for the mean porosity of specimens of this type of concrete c) What is the confidence level of the interval (21.0, 22.2)? d) How many specimens must be sampled so that a 90% confidence interval specifies the mean to within ± 0.3? [20.88%, 22.32%; 20.74%, 22.46%; 82.94%; 308]
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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 PS5 11 Examples - UNIVERSITY OF CALIFORNIA, LOS...

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