(Answered) Public policy and political science the thirty bench wine

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Public Policy and Political Science The Thirty Bench Wine Makers in Beamsville, Ontario, would like to determine if the alcohol content of its wine is determined by the grape variety. Samples from two Riesling wines, made from different grape varieties, were obtained and the alcohol content in each bottle was carefully measured.

a. Is this an observational or an experimental study?
b. What is the variable of interest?

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