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Question 4 An article in the Journal of Structural Engineering (Vol. 115, 1989) describes an experiment to test the yield str

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Answer #1
x (x-m)^2
95 999.2623
95 999.2623
102 605.7068
102 605.7068
102 605.7068
105 467.0401
105 467.0401
109 310.1512
125 2.595679
125 2.595679
129 5.70679
129 5.70679
141 207.0401
157 923.4846
161 1182.596
161 1182.596
167 1631.262
169 1796.818
sum 2279 12000.28

x=yield in KN

sample mean=m

ms n

n=total observation

m=22279/18

m=126.61

# sample mean 126.61 KN

Σα – m)2 TV η -1

s=sample standard deviation

12000.28 17

s=26.57

#sample standard deviation is 26.57 KN

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