For Research Methods class, we are ought to read this article: and then answers questions regarding the article.
The book we read for the class is "The Practice Of Social Research" by Earl Babbie (version 14E). In pages 14-18, the variables and attributes are explained.
-Reading questions:
Does Rap Music Cause Aggression?

Recall that in the experiment, 54 men were divided into two groups and exposed to misogynous or neutral lyrics, and qualities of their behavior toward a female actor was observed afterwards (whether they chose neutral or "violent/assaultive" materials to show her from a library of films).

1. What is the Research Question 2?

2. Variables:
a. What is the independent variable and its attributes?
b. What is the dependent variable and its attribute?

Using the three steps in establishing causality from lecture, work through the following questions.

Step 1: Are the two variables correlated?

The results of the experiment are summarized below.

Neutral Violent
Misogynous Rap 70% 30%
Neutral Rap 93% 7%

Are the two variables correlated? How do you determine this?

Step 2: Does the cause precede the effect, logically and temporally? How do you know this?

Step 3: Can the correlation between the two variables be explained by linking both to some third variable?

Finally, think back to the examples of empirical questions and policy/value questions. Whether rap music causes any particular effect on attitudes or behavior is an empirical question. Once we have answered the empirical question, positively or negatively, do we have any further professional obligation (e.g., to support or oppose regulation of media content)? (I need to write a cautionary policy for rap music now that I know its effects because of the research.)