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?
Choose 1 answer:
An observational study where the type of drink is the response
variable
An observational study where depression level is the response
variable
An experiment where the type of drink is the response variable
An experiment where depression level is the response variable