Answer and Explanation:
The Greeks made important contributions to philosophy, mathematics, astronomy, and medicine. ... The Greeks were known for their sophisticated sculpture and architecture. Greek culture influenced the Roman Empire and many other civilizations, and it continues to influence modern cultures today.
Answer:
D.) They must be representative of the population.
Explanation:
In general a sample collected from a set of naturally distributed data set must also follow the bell curve or natural distribution
In other way round it can be said that sample set must have the same characteristics as that of the main set and hence a sample must be representative of the population.
Option D is correct
I think the awnser is A. Hope this helps!
