Lesson 10 - Power and Sample Size Considerations

Lesson 10 Objectives

Upon completion of this lesson, you should be able to:

  • Describe the rationale for sample size calculations
  • Describe the relationships between sample size, power, variability, effect size, and significance level
  • Distinguish between type I & II error
  • Calculate the sample size needed for the following scenarios given the necessary preliminary data
    • Single proportion
    • Comparison of two proportions
    • Unmatched case-control study
    • Matched case-control study
    • Single mean
    • Comparison of two means