Question

which of the following best describes the main difference between an observational study and an experiment. experiments divide the sample into two groups. an observational study does not. an experiment deliberately imposes some treatment on individuals to measure their responses. an observational study observes individuals without imposing a treatment. an observational study deliberately imposes some treatment on individuals to measure their responses. an experiment observes individuals without imposing a treatment. observational studies divide the sample into two groups. experiments do not

Explanation:

In an experiment, researchers actively impose a treatment (like a new drug) on participants to see its effect. In an observational study, researchers just observe (like noting people's coffee - drinking habits and health without giving them any special coffee). The key is the imposition of treatment.

Answer:

An experiment deliberately imposes some treatment on individuals to measure their responses. An observational study observes individuals without imposing a treatment.