According to a study published in the National Library of Medicine, drinking matcha tea can help with depression. The study involved \[190\] mice that were all put in social isolation. Scientists gave each mouse either matcha tea or a placebo beverage that looked and tasted similar. Mice that drank matcha tea measured significantly lower levels of depression compared to those that drank the placebo beverage.
What type of study is this, and what is the response variable?