Understand what confidence intervals cover, what more data changes and what bias leaves behind.
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First lesson in this subject: Read data before calculating
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A confidence interval is made from a random sample. Repeat the sampling method and the intervals change, while the population mean stays fixed. Coverage is the share of intervals that contain that mean across repetitions. A particular calculated interval either contains the fixed mean or does not.
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First lesson in this subject: Read data before calculating
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Practice · Draw repeated samples and discover which intervals capture the true mean.
Book · Read distributions, question samples, and explore how groups and outliers change a conclusion.
Previous lesson · Use random assignments to understand how surprising a difference is.
Next lesson · Distinguish a real effect from the change expected after selecting unusual first results.
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