Two-tail test used in lieu of a one-tail test

Reference no: EM1396066

A. In hypothesis testing when is a two-tail test used in lieu of a one-tail test?

B. In hypothesis testing when is the "t test" used rather than the "Z test"?

C. What is the distinction between a Type 1 error and a Type 2 error?

Reference no: EM1396066

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