Statistical Summary

I could not find my choice in (Homework Field of study). So, this summary is for (Biostatistics) class.

Attached the article (science and statistics), please:
** Write a few lines about the  main question and design of the study and then write the summary for the statistical methods. Basically something like the abstract but the statistical section should be more  detailed than the rest.

I also attached the review of the biostatistics lectures we have, so that might help.