Number Dose (mg/kg) Survival Status
1st 200 0
2nd 260 X
3rd 200 X
4th 154 0
5th 200 0
6th 260 X
Arithmetic Mean 212.3 50% (LD50)
Standard Deviation (SD) 41 1.6 (Default dose)
Standard error of Mean (SEM) 16.7 7.9% (Confidence interval)
Geometric Mean 209 50% (LD50)
Harmonic Mean 212.3 50% (LD50)
Standard Deviation (SD) 41 1.6 (Default dose)
Standard Error of Mean 16.7 7.9% (Confidence interval)
Keys: X=Death,O Survival
Table 1: Stitzel hypothetical example