Which of the following is the best example of a random assignment in an experiment?

A. choosing every 10th person on a school's roster to complete a questionnaire. B. asking people at random to complete a questionnaire and choosing the first 50 who agree.

C. allowing participants to choose which treatment they receive flipping a coin to determine whether each subject is in the experimental group or the control group.

C. Allowing participants to choose which treatment they receive flipping a coin to determine whether each subject is in the experimental group or the control group.

Explanation:

Random Assignments means to chance procedures in psychology experiments so that each participant gets same opportunity to be assigned to any group. The participants are randomly assigned to different groups. The random assignment can involve tactics such as drawing names out of a hat, rolling dice and tactics such as flipping coin.

Random assignments are different from random selection as the random selection means how the participants are randomly chosen to represent a larger population while the random assignment means how the chosen participants are assigned to different groups.