The Difference Between a Single Blind Study and a Double

The difference between a single blind study and a double blind study is that in a double blind study,

A) neither experimenter nor participants know of the particular conditions in the study.
B) correlational approaches are always preferred to more experimental analyses.
C) it takes twice as many participants to complete an adequate double blind study.
D) only visually impaired participants are able to fulfill the needs of the study.

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