Sure, unless there is some sampling bias like more tests being done at a given time of day, or a given day of the week. Or tests probing particular aspects of c

Sure, unless there is some sampling bias like more tests being done at a given time of day, or a given day of the week. Or tests probing particular aspects of cognition that get emphasised or de-emphasised in the education system. Even so, most of the discussions about IQ are about individual scores and a lot of pseudoscience.