Is P 0.001 statistically significant?
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Studied at the University of Barcelona, Lives in Barcelona, Spain.
The choice of significance level at which you reject H0 is arbitrary. Conventionally the 5% (less than 1 in 20 chance of being wrong), 1% and 0.1% (P < 0.05, 0.01 and 0.001) levels have been used. These numbers can give a false sense of security. ... The significance level (alpha) is the probability of type I error.
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Lucas Clark
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The choice of significance level at which you reject H0 is arbitrary. Conventionally the 5% (less than 1 in 20 chance of being wrong), 1% and 0.1% (P < 0.05, 0.01 and 0.001) levels have been used. These numbers can give a false sense of security. ... The significance level (alpha) is the probability of type I error.