Answer:
Research methods for collecting data
Research method Primary or secondary? Qualitative or quantitative? When to use
Experiment Primary Quantitative To test cause-and-effect relationships.
Survey Primary Quantitative To understand general characteristics of a population.
Interview/focus group Primary Qualitative To gain more in-depth understanding of a topic.
Observation Primary Either To understand how something occurs in its natural setting.
Literature review Secondary Either To situate your research in an existing body of work, or to evaluate trends within a research topic.
Case study Either Either To gain an in-depth understanding of a specific group or context, or when you don’t have the resources for a large study.
Explanation:
