In experimental research, the researcher's control of the "treatment" is referred to as:
a. bias.
b. manipulation.
c. random selection.
d. validity.
ANS: B
Controlling the treatment or intervention is the most commonly used manipulation.
Bias is when the researcher shows preference.
Random selection describes a process of ensuring that the sample is representative of the population under study.
Validity refers to the "trueness" of the tool; is it measuring what it says it measures.
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