How can researchers ensure that their qualitative and quantitative data are complementary and not contradictory in their analysis of a research subject?

Researchers can ensure that their qualitative and quantitative data are complementary by using a mixed methods approach, where both types of data are collected and analyzed simultaneously. They can also triangulate their findings by comparing and contrasting the results from both types of data to look for patterns and discrepancies. Additionally, researchers can use qualitative data to provide context and depth to the quantitative findings, helping to explain the "why" behind the numbers. Finally, researchers should be transparent about their methods and assumptions, acknowledging any potential limitations or biases in their data collection and analysis.