The difference between case studies and surveys
Surveys are done to generalize about a population whereas case studies look at more discrete factors of particular individuals and so cannot be generalized.
n = sample population
N = target population
You have to be specific whenever you define/describe population
What about confidence limits? require random sample technique
How do we do a true random sample? number target population; choose people at random using some method. You can use a system to randomize--(e.g. every fifth student) systematic random sampling
Cluster sampling--individual units within a large population.
n : k rations...are variables... for every k, the rule of thumb is to have 10 n's to getreliable data. Formulas include Spearman Brown,