Why is the use of existing data, especially in comparative and historical research, especially helpful to students?

Question

Quizplus · Accepted Answer

Using existing data requires fewer resources than collecting original data, which makes it more accessible and feasible for students to conduct comparative and historical research.

Answer: C
 Existing data helps eliminate problems with sampling bias because the data is typically collected from a larger population and is more representative than data collected by an individual student.

Why Is the Use of Existing Data, Especially in Comparative