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A researcher attempts to evaluate the effect of method of feed | Sociology | GS Society | Social Issues [reliableANDvalid]

A researcher attempts to evaluate the effect of method of feeding on anxiety – proneness children. Which method of research would be appropriate for this?
[#Sociology-Quiz-reliableANDvalid]
Anonymous Quiz
29%
Experimental method
18%
Ex-post-facto method
34%
Survey method
18%
Case study method