Soal SMA · Analisis · Kesulitan 3/5
Read the following passage and answer the question. In a study on the link between exercise and stress, participants who exercised regularly reported lower stress. The researchers controlled for age, gender, and income. However, they did not control for sleep quality. It is known that exercise improves sleep quality, and better sleep reduces stress. Which of the following best describes the role of sleep quality in this study?
- A.It is an independent variable.
- B.It is a dependent variable.
- C.It is a mediating variable.
- D.It is a control variable.
Kunci jawaban & pembahasan
Jawaban: It is a mediating variable.
Sleep quality mediates the relationship: exercise improves sleep, which in turn reduces stress. It is not controlled, so it may explain the link.
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