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Confidence Intervals or Interval Estimates for Proportions

Learn how to do confidence intervals/interval estimates for proportions. Includes calculating the z* critical value for different confidence levels using Excel. Uses the normal distribution (approximating binomial). 0:00 Introduction of example 1:10 Review of sampling distribution 2:54 Point estimate and standard error 4:33 Calculating standard error in Excel 5:53 What is a critical value (z*)? And confidence levels 8:45 Calculating the critical value (using Excel, could also use a z-score table or other technology) 13:36 Calculating the interval estimate (final steps) For interval estimates for means, see this video:    • Confidence Intervals or Interval Estimates...   For a discussion of point estimates vs. interval estimates, see this video:    • Point Estimates vs Interval Estimates   For central limit theorem for proportions about the sampling distribution of a sample proportion, see this video:    • Central Limit Theorem for Proportions - Sa...