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For test sessions one of us administered the tests so the administration was standardized. However for the 7th, 8th (A and B) and 9th grade at GS, test administration was done by a teacher, who were told to give the same instructions as was given to the rest of the pupils. Said teacher was present at one of the previous test sessions as to minimize errors while administering the tests.   \subsection{Test methodology}  The tests were filled out with pen and paper, which were later digitized manually. If more than one answer or no answer was marked on the test it counted as "not correct". The age of the pupils at the time the test was administered and the results were computed, which will be described in section~\ref{analysis}. section~\ref{sec:analysis}.  Before handing out the test, the pupils were given oral instructions to minimize confusion for how to proceed with the test. The instructions were as follows:  \begin{quote}  There are 5 questions, each with multiple answers.You are only to mark one answer per question, meaning you will have a total of five answers when you are done. At the very top of the test, write down today's date and your birthday.