In order to establish a connection between an explanatory and ...

[Davideckstein7]

In order to establish a connection between an explanatory and response variable in an observational study, what is needed?
 a. Statistical methods that examine the connection.
  b. A comparison to determine if changes in the explanatory variable are related to changes in the response variable.
  c. Either a) or b)
  d. You can never establish a connection between an explanatory and a response variable without doing a randomized experiment.

Question 2

Name one disadvantage and one advantage of an observational study over an experiment.

[jamesnevil303]

Answer to Question 1

C

Answer to Question 2

DISADVANTAGE  THE RESEARCHERS OBSERVE, BUT CANNOT CONTROL, THE EXPLANATORY VARIABLES. ADVANTAGE  THEY ARE MORE LIKELY TO MEASURE PARTICIPANTS IN THEIR NATURAL SETTING (AND DO NOT MANIPULATE THEIR ENVIRONMENT).

[Davideckstein7]

Thanks for the timely response, appreciate it

[blakcmamba]

Great answer, keep it coming