Question

question #6
in which statistical study does the researcher intentionally intervene to arrange for a comparison of results?
filing out questionnaire
observational study
experimental study
survey
question #7
which of the following statements best describes the main difference between an experiment and an observational study?
an observational study deliberately imposes some treatment on individuals to measure responses. an experimental study observes responses without imposing any treatment.
observational studies divide the sample into two groups, but an experimental study does not.
an experiment deliberately imposes some treatment on individuals to measure responses. an observational study observes responses without imposing any treatment.
an experiment divides the sample into two groups, but an observational study does not.

Explanation:

In a statistical study, an experimental study involves the researcher intentionally intervening by imposing treatments to compare results. The main difference between an experiment and an observational study is that an experiment imposes treatments to measure responses while an observational study just observes without imposing treatments.

Answer:

Question #6: C. Experimental Study
Question #7: C. An experiment deliberately imposes some treatment on individuals to measure responses. An observational study observes responses without imposing any treatment.