Appendix C to Part 1356 - Calculating Sample Size for NYTD Follow-Up Populations

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Appendix C to Part 1356 - Calculating Sample Size for NYTD Follow-Up Populations

1. Using Finite Population Correction

The Finite Population Correction (FPC) is applied when the sample is drawn from a population of one to 5,000 youth, because the sample is more than five percent of the population.

• (Py)(Pn), an estimate of the percent of responses to a dichotomous variable, is (.50)(.50) for the most conservative estimate.

• Acceptable level of error = .05 (results are plus or minus five percentage points from the actual score)

• Z = 1.645 (90 percent confidence interval)

• N = number of youth from whom the sample is being drawn

2. Not Using Finite Population Correction

The FPC is not applied when the sample is drawn from a population of over 5,000 youth.

[73 FR 10372, Feb. 26, 2008]

                    
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