a study where researchers apply treatments and observe outcomes. a experimental study b census c…

a study where researchers apply treatments and observe outcomes. a experimental study b census c observational study d qualitative
Answer
Brief Explanations:
The description "researchers apply treatments and observe outcomes" directly matches the definition of an experimental study, where researchers manipulate variables (treatments) to test effects. A census collects data from an entire population, an observational study only observes without intervention, and qualitative study focuses on non-numeric data—none fit the given description.
Answer:
A. experimental study