-China's physical geography made farming possible but travel and communication difficult.
-geography kept early China culturally and economically isolated from the rest the world.
Answer:
1. cluster samples rely on clusters of participants;
multistage samples collect data from participants at different stage
Explanation:
Under clusters sampling, sampling plan involves the division of total population into groups (known as clusters) where simple random sample of the groups is selected; elements in each cluster are then sampled.
Multistage sample involve sampling in stages which becomes smaller in each stage. It could be a complex form of cluster sampling.
That is false I took the test put true and it said it was wrong so false