What type of study focuses on investigating marginalized groups through mixed methods?

The correct choice, which highlights transformative design, is an approach that specifically aims to address issues related to marginalized groups. This design is characterized by the incorporation of both qualitative and quantitative methods—essentially a mixed methods approach—which allows for a more comprehensive understanding of the experiences and challenges faced by these populations.

In transformative design, researchers not only collect data but also engage with these groups to empower them and advocate for social change based on the findings. The emphasis on social justice and inclusion distinguishes transformative design from other study types, as it seeks to give voice to those who often lack representation in research. This type of study recognizes the complexities and contextual factors influencing marginalized groups, fostering a more nuanced analysis.

While other options may involve case studies or mixed methods in various contexts, they do not carry the same inherent focus on social justice and empowerment central to transformative research. For example, intrinsic case studies are typically devoted to understanding a specific instance without a broader focus on social issues or marginalized communities. Collective case studies may involve multiple cases but may not necessarily use a transformative approach toward marginalized groups. Embedded and other designs might involve mixed methods, but they do not emphasize the commitment to empowerment and advocacy that characterizes transformative design.