Answer:
True. However, those are not two types of discussion groups, but only one.
Explanation:
Online forums possess a tree-like structure. A forum can contain several sub-forums discussing topics somehow related to the original subject.
Forum conversations differ from chat, because messages are typically longer, and are stored for longer. Each conversation in an online forum is called a "thread".
A bulletin board is a<em> type </em>of online forum in which its participants post questions to a related topic and other members try to provide the answer to that question. The answer is open to discussion and other members are free to intervene and correct the answer, if needed. A moderator is usually present, to ensure ethical behaviour and encourage the participants.
Answer: Stratified random sampling
Explanation:
In stratified random sampling the population of choice is partitioned into subgroups. Then the samples for study are selected randomly from the subgroups.
The given situation is the example of stratified random sampling this is because of the fact that the population is divided into subgroups on the basis of the social class and age. Then the voters were randomly selected from each subgroup.
Population density is the number of people that live in a region, divided by a specific measurement such as square miles or square kilometers.
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