If the pattern of the distribution is "flatter" than a normal distribution (the ends of the histogram is quiet higher than expected with the normal districbution assumption), the main reasons may be :

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Accepted Answer

Very often, this is the effect of a very small sample size (less than 30), you can try a "student t distribution" instead of normal distribution to conclude about the process.

Accepted Answer

You really don't have a normal distribution.

Answer

Statistics are so unpredictable

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If the pattern of the distribution is "flatter" than a normal distribution (the ...

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