A finite population contains a proportion p defective items. A sample of size n is drawn at random without replacement. If N is small i.e. N < 50, the number of defectives observed in the sample follows :
If the population size in N in (1) above is big, and the sample size n is small relative to N the number of defectives observed in the sample can be approximated by:
If the sample is large and the proportion defective is small, the observed number of defectives in the sample can be approximated by:
Which distribution describes waiting time between Poisson occurrences?
Which distribution measures continuous variables such as height, weight?
Which distribution consists of repeating trials until first success?
The Normal Distribution
