Which method is commonly used to analyze qualitative data?

B is the correct answer because content analysis is specifically designed for analyzing qualitative data. This method involves systematically reviewing and interpreting textual or visual information to identify patterns, themes, or insights. It allows researchers to categorize data and draw meaningful conclusions from qualitative inputs, making it an essential tool in qualitative research.

In comparison, statistical regression analysis, descriptive statistics, and decision tree analysis are primarily focused on quantitative data. Statistical regression analysis involves examining relationships between variables usually represented numerically. Descriptive statistics summarize and describe features of a data set, like mean or standard deviation, which apply to quantitative data. Decision tree analysis is a predictive modeling approach that uses a tree-like model of decisions and their possible consequences, also grounded in quantitative analysis. Thus, these methods do not cater to qualitative data in the same way that content analysis does.