Question: What is the decision to use the unit normal (i.e., Z) distribution versus the student's t distributions as the null distribution for hypothesis testing based

  1. What is the decision to use the unit normal (i.e., Z) distribution versus the student's t distributions as the null distribution for hypothesis testing based upon?
  2. . Define the standard error of a statistic. In a general sense, what does it refer to/measure? Then, define the standard error of the mean. What does it refer to/measure?

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