83 Assessing the bending strength of a wooden roof. Refer to the Journal of the International Association
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83 Assessing the bending strength of a wooden roof. Refer to the Journal of the International Association for Shell and Spatial Structures (Aug. 2004) study to estimate the mean bending strength of imported white wood used on the roof of an ancient Japanese temple, presented in Exercise 38 .
Suppose you want to estimate the true mean breaking strength of the white wood to within 4 MPa, using a 90%
confidence interval. How many pieces of the imported wood need to be tested? Recall that the sample standard deviation of the breaking strengths found in the study was 10.9 Mpa.
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