In an experiment, the researcher was unintentionally talkative to one of the participant groups. What best describes the threat to internal validity and why is it a threat?
a. Randomness, since being talkative can make this particular group more relaxed and better able to perform.
b. Participant-maturation interaction, since being friendly to one group can introduce a confound.
c. History, since this unintended interaction was not part of the independent variable, a confound was introduced.
d. Testing, since the other group might feel cheated for being treated more formally by the researcher, and this introduces counterbalancing.
Question 2
For a study to be considered a true experiment according to Campbell and Stanley, there must be at least ____ level(s) of the independent variable.
a. random
b. 1
c. 2
d. 3
Functional groups
Political parties vs interest groups
Table 6.1 illustrates the main regime types and their differences. It breaks the regimes into four
Alleles and blood groups
The biochemical basis of the ABO blood groups
Miller's Experiment