9.68 Because in the Poisson case, it follows from the Central Limit Theorem that will be approximately
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9.68 Because in the Poisson case, it follows from the Central Limit Theorem that will be approximately normally distributed with mean and variance l>n, for large n.
l X
V(Xi) = l l
l X1 Xn a Use the above facts to construct a largesample confidence interval for .
b Suppose that 100 reinforced concrete trusses were examined for cracks.The average number of cracks per truss was observed to be four.
Construct an approximate 95% confidence interval for the true mean number of cracks per truss for trusses of this type. What assumptions are necessary for your answer to be valid?
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Related Book For 
Probability And Statistics For Engineers
ISBN: 9781133006909
5th Edition
Authors: Richard L Scheaffer, Madhuri Mulekar, James T McClave, Cecie Starr
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