experimentobservationIVcollectingdatalinegraphintervalsplanninginterpretingdatavariabletitleaxisbargraphproblemDVcontrolvariableorganizingdataanalyzingdatatestablequestionpiegraphhypothesisdatadatatableproceduretheoryexperimentobservationIVcollectingdatalinegraphintervalsplanninginterpretingdatavariabletitleaxisbargraphproblemDVcontrolvariableorganizingdataanalyzingdatatestablequestionpiegraphhypothesisdatadatatableproceduretheory
B
N
B
G
O
G
I
B
O
O
G
N
G
O
G
N
I
I
B
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I
B