Final answer:
Secondary Data Analysis involves using pre-existing data for analysis. It is a valuable research technique because it allows for the examination of large data sets and can be cost-effective and time-efficient.
Step-by-step explanation:
Secondary Data Analysis involves using pre-existing data for analysis. This method allows researchers to analyze data collected by others and apply new interpretations. It is a valuable research technique because it allows for the examination of large data sets and can be cost-effective and time-efficient.