Probability questions

I need an explanation for this Probability question to help me study.

Answering the following including formula references. APA not needed.

  1. Explain what a confidence interval is, and what is the confidence level?
  2. Explain in what situations you can use the z statistic to construct a confidence interval for the mean of a population?
  3. Explain what is the test statistic used for constructing confidence interval on a proportion.
  4. Explain why and when t statistic is used in constructing a confidence interval for the mean of a population.

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