For researching child obesity case and comparing child obesity case with adult obesity ( to show relation between them)) You must specify which quantitative or qualitative approach you will be using.

for example, paired or independent t-tests and ANOVA for quantitative research. Similarly , there are other methods for qualitative research example Chi-square test and Triangulation

Explain at least one test for Quantitative and one test for qualitative research that applies for child obesity research case in brief with example.