New answers tagged statistics
1
The problem with your proposed solution of using 3 times the standard deviation, is that it doesn't take into account how accurately the standard deviation has been determined. As you only have 10 test values, it has a significant error bar, which needs to be accounted for somehow.
I would recommend using the method in EN1990 annex D or whatever design code ...
2
Data is data. This is the capability of the design and manufacturing process. Trust the data.
If there is a need to improve the quality of the data one could take for example 3 measurements for each sample and then take the average. So if there is a concern of quality of the data collection, this method will help minimize the error, with regard to the 22.1kN ...
1
Keep in mind that the failure doesn't have to follow a normal distribution. Weibull distribution is a much better fit for real life situations. And to be more specific, a weibull with a shape like the following. Near one end is very similar to a normal distribution but it is very skewed.
So regarding your data, the 22.1[kN] and the 20.7 [kN] seem like ...
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