Population
Sample mean x̄–
True mean μ–
Error–
Tap or hover a unit to see its group and value.
Sampling distribution of x̄
True mean μAverage of x̄
- Samples drawn
- 0
- Average of the sample means
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- Bias (average − μ)
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- Standard error (SD of x̄)
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- Theory: simple random SE
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Your sample
- Method
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- Sample size
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- Sample mean (x̄)
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- True mean (μ)
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- Error (x̄ − μ)
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- Sample SD
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Units chosen (id · value)
Which method is most accurate?
Runs 2,000 samples of every method on this population at your current sample size. A smaller standard error means a more reliable estimate.