Research Findings
	2) Even if stated, most students do not justify their conclusions based on the uncertainty Judgements are made based on arbitrary criteria: – “Our percent error was only 4%, so our experiment proved the theory.” – “I decide by how much two measurements differ in order to see if they agree.” – “The result should be accurate as long as the error is less than 10%.”    Similar findings in other studies (Sere; Garratt)