Question: What is sampling variability and why is it important to understand? What is the formula for an 80% confidence interval for a population proportion? What

  1. What is sampling variability and why is it important to understand?
  2. What is the formula for an 80% confidence interval for a population proportion?
  3. What is the correct interpretation of a 95% confidence interval?
  4. How does a standard error differ from the margin of error?
  5. What is a 99.9% margin of error for a sample mean based on a sample size of 200? Your answer needs to be in terms of the population standard deviation

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