sampling-math

random

select members from the population using some form of random *generator

stratified random

put the population into groups first and select a pre-determined number of members form each group at random

systematic

a rule is used to pick members of the population

self- selected

members of the population select to participate themselves

convenience

only members that are easily accessible are selected

population

all the people/ animals/things being studied

sample

a smaller group of the population that is meant to represent the whole population

permutation

set of values is an arrangement of those values into a specific order

the order you line up matters

Total P how many you are lining up

nPr

combination

an arrangement, without regard to order, nCr

probability

amount you want/ total

odds

amount you want/ amount you don't want

mean

all the numbers added up divided by the amount of numbers there are

median

middle number

if two add then divide by two

mode

most often

range

highest number minus lowest number