The purpose of the Board of Review is to assure that all assessments in the Village of Poynette are correct and fair. The board shall begin it’s deliberations with the presumption that the assessor's valuation is correct. That presumption may be rebutted by a sufficient showing by the objector that the valuation is incorrect. From the evidence before it the board shall determine whether the assessor's assessment is correct. If the assessment is too high or too low, the board shall raise or lower the assessment accordingly and shall state on the record the correct assessment, and that the assessment is reasonable in light of all of the relevant evidence that the board received.