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Keywords:

  • Teaching;
  • Confidence intervals;
  • Displaying data;
  • p-values;
  • Interactive software

Summary

A picture of a 95% confidence interval (CI) implicitly contains pictures of CIs of all other levels of confidence, and information about the p-value for testing a null hypothesis. This article discusses pictures, taken from interactive software, that suggest several ways to think about the level of confidence of a CI, p-values, and what conclusions can be drawn from inspecting a CI.