h1 - Gil Tal ECI 114 Homework Assignment 1 1. Problem 6-8...

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Gil Tal ECI 114 Homework Assignment 1 1 . Problem 6-8 (a), (b), p. 195 a . Mean: N y Y N i i = = 1 = 2.173333 b . Sample Variance: = 1 - N ) Y - Y ( = s 2 i N 1 = i 2 0.4303 Standard variation: s = s 2 = 0.656011 c . d . The population in this problem is the length of fatigue crack propagation cyclically loaded wing boxes in mm, The sample of interest is 9 length of fatigue crack propagation cyclically loaded wing boxes in mm. 2. s Y ± 68.57% of the data empirical rule : 68% s Y 2 ± 95.71% of the data empirical rule: 95% , 3 s Y ± 100% of the data empirical rule “nearly all” The data generally follow the Empirical Rule. 3. Distributions maximum 3.0200 minimum 1.1500 range 1.87 median 2.1300
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Quantiles 100.0% maximum 2265.0 99.5% 2265.0 97.5% 2227.5 90.0% 1910.0 75.0% quartile 1740.0 50.0% median 1452.0 25.0% quartile 1093.5 10.0% 865.0 2.5% 623.3 0.5% 375.0 0.0% minimum 375.0 Moments Mean 1407.841 Std Dev 403.797 Std Err Mean 48.611 upper 95% Mean 1504.843 lower 95% Mean 1310.838 N 69.000 CDF Plot 4. problem 2-20 a. A’ A C B
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) ( ) ( ' B
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h1 - Gil Tal ECI 114 Homework Assignment 1 1. Problem 6-8...

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