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A researcher investigates if a server drawing a smiley face on the check increases the amount of the tip. Servers are divided into two groups:

A researcher investigates if a server drawing a smiley face on the check increases the amount of the tip. Servers are divided into two groups: one group draws the smiley face, the other does not. Diners do not know about the study. This design of a study is ? A. Observational B. Experimental, blind C. Experimental, double-blind D. Retrospective

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