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“statistically significant”不等于 “scientifically important”： 1、scientifically unimportant 使用等方差假设的双尾t检验 P<0.0001<0.05，有显著性差异 statistically significant 但提升幅度仅有1% scientifically unimportant (Trivial) 2、scientifically important
P<0.0001<0.05，有显著性差异 statistically significant 但提升幅度高达200% scientifically important
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