Sample Size Notes

Sample Size

• Sample size is denoted by N (total subjects in the sample) or n (total subjects in a subgroup).

• Sample size is determined by:

  • Convenience

  • Expense

  • Statistical power: likelihood that the sample includes sufficient subjects to conclude that the hypothesis is true within an acceptable margin of error.

• Larger sample sizes are generally better for accuracy and inferences about the broader population.

Sample Size

Sample size is denoted by N (total subjects in the sample) or n (total subjects in a subgroup).

Sample size is determined by:

• Convenience

• Expense

• Statistical power: likelihood that the sample includes sufficient subjects to conclude that the hypothesis is true within an acceptable margin of error.

Larger sample sizes are generally better for accuracy and inferences about the broader population.

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