Question

Explain the difference between a stratified sample and a cluster sample. (which apply)
A. In a stratified sample, random samples from each strata are included.
B. In a cluster sample, the only samples possible are those including every kth item from the random starting position.
C. In a cluster sample, every sample of size n has an equal chance of being included.
D. In a cluster sample, random samples from each strata are included.
E. In a stratified sample, the only samples possible are those including every kth item from the random starting position.

Answer 1

F. In a stratified sample, every sample of size n has an equal chance of being included.
G. In a cluster sample, the clusters to be included are selected at random and then all members of each selected cluster are included.
H. In a stratified sample, the clusters to be included are selected at random and then all members of each selected cluster are included.

Please help :)

Answer 2

The definitions here should help you make the correct choices:
http://www.stats.gla.ac.uk/steps/glossary/sampling.html