A true experiment requires which of the following? Select all ...

[NguyenJ]

A true experiment requires which of the following? Select all that apply.
 
  A) Control
  B) Intervention
  C) Blinding
  D) Randomization

Question 2

The following are all purposes of a research hypothesis, except:
 
  A) Proving the validity of a theory
  B) Communicating researchers' expectations
  C) Setting the stage for statistical analyses
  D) Providing direction to the research design

[LP]

Answer to Question 1

A, B, D
Feedback:
Experiments (or randomized controlled trials, RCTs) involve an intervention (the researcher manipulates the independent variable by introducing an intervention; control (including the use of a control group that is not given the intervention and represents the comparative counterfactual); and randomization or random assignment (with participants allocated to experimental and control groups at random to make the groups comparable at the outset). Blinding is a means of controlling external sources of bias, but is not required or even feasible for all experiments. By keeping data collectors and others unaware of group allocation or study hypotheses, researchers minimize the risk that other people involved in the study will influence the results.

Answer to Question 2

A