researchers periodically survey a few thousand of the patients taking a certain medication in order to make…

researchers periodically survey a few thousand of the patients taking a certain medication in order to make connections between that medication and the subjects general health. this method of gathering data is classified as\n○ a census.\n○ a sample survey.\n○ an experiment.\n○ an observational study.

researchers periodically survey a few thousand of the patients taking a certain medication in order to make connections between that medication and the subjects general health. this method of gathering data is classified as\n○ a census.\n○ a sample survey.\n○ an experiment.\n○ an observational study.

Answer

Brief Explanations:

A census involves surveying an entire population. Here, only a few thousand patients (a subset of all patients taking the medication) are surveyed, so it's not a census. An experiment involves manipulating variables. Since no manipulation is done, it's not an experiment. A sample survey is a type of observational study where data is collected from a sample. In this case, researchers are simply observing and gathering data from a sample of patients without any intervention, making it an observational study.

Answer:

an observational study.