- This topic has 8 replies, 7 voices, and was last updated Feb-1811:35 am by Karsh.
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We only use 1 significance level, so there’s only 1 alpha, which is the probability of a type 1 error. The bigger the alpha is, the bigger is our rejection region, which leads to a greater probability of a type 1 error, which is rejecting the null hypothesis, when it’s actually true. Mind you, we can test at difference significance levels, i.e 5% or 1%, so what falls between the region of 5% and 1% would mean a rejection of the null at the 5% level, and a failure to reject at the 1% level. But we’re often supplied with one significance level, so that’s a way to have the concept stick.
Type 1 error, corresponds with 1 significance level. Alpha has a positive relationship with type 1, and an inverse relationship with type II.
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It may sound a bit silly but I remember is this way…I think of a court of law and say the worst error they could make is finding an innocent man guilty. In court it is “innocent until proven guilty”, so the null hypothesis is innocence.Finding an innocent man guilty is the same as “rejecting the null hypothesis. I then relate the number 1 to “worst” therefore resulting in a type 1 error of rejecting the null when true…..I.e. Finding an innocent man guilty.
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