Calculating S.D. From Data (Range)
Average fecundity = .34 (range .14 – .54)
Calculate S.D., based on years / data points
- For N ~ 10, assume range defines +/- 1.5 SD.
- For N ~ 25, assume range defines +/- 2SD
- For N ~ 50, assume range defines +/- 2.25 SD
- For N ~ 100, assume range defines +/- 2.5 SD
- For N ~ 200, assume range defines +/- 2.75 SD
- For N ~ 300, assume range defines +/- 3 SD