Dichotomous key for Biometry

1. The variable is discreet - 2

The variable is continuous - 4

2. The events are independant of each other or are assumed to be independant. You know the probability of success (p) and the sample size (k) - Binomial

You do not know the probability of success - 3

3. The events appear random in time or space, the events are independant of each other, or are assumed to be independant. You do not know the probability of success, p < 0.1 and kp < 5. You do know . - Poisson

4. You are trying to estimate the variance. - Chi Squared distribution

5. You are not trying to estimate the variance. You know and , the sample size is large or the study period is over several years. - Normal distribution - (z)

6. The sample size is small, you do not know and , but you can estimate them with ´ and s.

- t-distribution