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10.03.2020 •
Mathematics
A Brinell hardness test involves measuring the diameter of the indentation made when a hardened steel ball is pressed into material under a standard test load. Suppose that the Brinell hardness is determined for each specimen in a sample of size 32, resulting in a sample mean hardness of 64.3 and a sample standard deviation of 6.0. Calculate a 99% lower confidence bound for true average Brinell hardness for material specimens of this type.
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Ответ:
61.57
Step-by-step explanation:
Sample size (n) = 32
Sample mean hardness (X) = 64.3
Sample standard deviation (s) = 6.0
Z-score for a 99% confidence interval (Z) = 2.576
The lower confidence bound (L) for a confidence interval is determined by the following expression
Applying the given data:
For the given material, the lower confidence bound for true average Brinell hardness is 61.57.
Ответ:
idk
Step-by-step explanation: