Quantitative V Qualitative Research

Would you help me to get started on the following question:

When looking at psychological research, you  find there are many scientists who avoid using qualitative data. Examine the various statistical techniques described for different study designs. Do you see more qualitative or quantitative references? Why do you think some psychologists are more comfortable with conducting studies using quantitative data instead of qualitative data? What would be an advantage to using qualitative data along with quantitative data?