An observational study is done to see if eating at least two ...

[danielfitts88]

An observational study is done to see if eating at least two apples a week helps prevent tooth decay in children. However, the researchers are aware that children who eat apples may also drink less soda, so they measure soda consumption as well. In this example, soda consumption is an example of
 a. an interacting variable.
  b. an explanatory variable.
  c. a response variable.
  d. a confounding variable.

Question 2

An experiment is usually preferred to an observational study because
 a. one can draw a cause and effect conclusion in an experiment but not in an observational study.
  b. it is easier to collect data from an experiment than it is from an observational study.
  c. it is cheaper to run an experiment than it is to do an observational study.
  d. volunteers can be used for an experiment but not for an observational study.

[kthug]

Answer to Question 1

D

Answer to Question 2

A

[danielfitts88]

TY

[kthug]

You're welcome