Statistics Questions.

Hi! So this is my statistic class, and I just need help on a few questions based on an article. I linked the article below. I have attached the questions for the article as well. I will rate, TIA!!!

Were there any confounding variables that can invalidate the study? Consider the source of the study. Is it reliable? What was the conclusion of the study? Does this seem reasonable based on what we have learned so far? Do they suggest future research ideas? If so, mention some. Anything else you learned from reading the article? Explain how some of the topics we discussed this semester are used in this article