History (H)refers to the occurrence of events before the experiment.
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Q2: Test units are individuals,organizations,or other entities whose
Q3: With experimental designs,it is possible to control
Q4: Independent variables are variables or alternatives that
Q5: The conditions of concomitant variation,time order of
Q6: Evidence of concomitant variation,time order of occurrence
Q8: The longer the time interval between observations,the
Q9: Extraneous variables are also called confounding variables
Q10: There is no problem developing experimental designs
Q11: Independent variables are the variables that measure
Q12: Causality refers to when the occurrence of
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