KA 2: experimentation: sampling Flashcards
1
Q
where it is impractical to measure every individual..
A
..a representative sample of the population is selected
2
Q
what determines the appropriate sample size?
A
the extent of the natural variation within a population
3
Q
what do more variable populations require?
A
a larger sample size
4
Q
what should a representative sample share?
A
the same mean and degree of variation about the mean as the population as a whole
5
Q
describe random sample
A
members of the population have an equal chance of being selected
6
Q
describe systematic sampling
A
members of a population are selected at regular intervals
7
Q
describe stratified sampling
A
the population is divided into categories that are then sampled proportionally
