A twotailed test actually has two critical values one

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Unformatted text preview: ample is more extreme than the critical value, you reject the null hypothesis; otherwise you retain the null. For computing confidence intervals, you always want the critical value for a two ­tailed test. A two ­tailed test actually has two critical values – one positive and one negative – but these have the same absolute value (i.e., one is the negative of the other), so for confidence intervals we just think about the positive one. For t ­tests, we call this positive critical value tcrit. In a two ­tailed test, we split the probability, α, of a Type I error equally between the two tails of the distribution. In oth...
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