In a research study on the impact of Internet surfing on exam performance, it was found that as the number of hours spent on Internet surfing increases, exam performance deteriorates. This study is an example of

Finding that more surfing hours accompany poorer exam scores is correlational research.

The experimental method would manipulate surfing time, not merely observe it.

A case study focuses on one individual or unit.

Descriptive research portrays conditions without linking two variables.

This shows a negative correlation between two measured variables.

The link does not prove that surfing causes poor performance.