Question: For each statement, decide if it is right or wrong and justify your answer.

1. You are planning a small study in Miami-Dade County to determine if there exist any relationships between individual depression state and his/her socio-economic conditions. Choosing a random sample from the Miami-Dade phone directory will produce a representative sample of the Miami-Dade county population.
2. Students’ grades in any given course constitute an example of variables which could be on either numerical or categorical scale.
3. In a unimodal and symmetric data distribution, the mean is always greater than the median.
4. In the absence of any type of discrimination, «the race of an individual» and «the fact that this individual could rent a specific apartment» are independent events.

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