(Answered) Question describing the z test in an article describing

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Question: Describing the z test. In an article describing hypothesis testing with small sample sizes, Collins and Morris (2008) provided the following description for a z test: "Z is considered significant if the difference is more than roughly two standard deviations above or below zero (or more precisely, IZI > 1.96)". Based on this description,

(a) Are the authors referring to critical values for a one-tailed z test or a two-tailed z test?

(b) What alpha level are the authors referring to ?

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