What type of analysis would you use to quantitatively summarize results of previous studies?

Meta-analysis is the correct choice for quantitatively summarizing results of previous studies because it involves systematically combining data from multiple studies to arrive at a comprehensive understanding of an area of research. This method allows researchers to assess the strength of a particular effect or relationship by aggregating findings, which can reveal patterns or insights that may not be identified in individual studies.

In contrast, qualitative analysis focuses on understanding underlying themes and patterns through non-numerical data, making it unsuitable for quantitative summarization. Statistical significance testing, while important for evaluating the results of individual studies, does not itself summarize data across multiple studies. Thematic analysis similarly emphasizes exploring themes and patterns within qualitative data, which would not provide a numerical summary of previous research outcomes.