But they also say the study shows a "wide range of achievement, with a large difference between the scores of the highest and lowest achievers".

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Over the past two months, the difference in Buzz scores between the two groups has begun to diminish, returning to nearly where they were before the campaign.

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Whether or not it was change of formation that made the difference, the scores were level a minute into the second half when Edu misdirected his attempt to head clear a Tino Costa free-kick into the corner of the net from all of 15 yards.

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His inability to convert his starts into big scores is the difference between having a poor Test average and having an excellent average.

BBC: A sense of perspective required

Although previous studies suggested a mere title is enough to produce a detectable increase in an individual's sense of power, Dr Huang and Dr Galinsky found no difference in the word-completion scores of those told they would be managers and those told they would be subordinates.

ECONOMIST: How you hold yourself affects how you view yourself

The difference was equivalent to the average variation in cognitive scores between children born at a normal gestational weight and those weighing less than 3.5 pounds, the researchers said.

WSJ: Exercise in Short Bursts Is Effective

Students' test scores are based on their precise age, because even a month can make a difference in the development of young children.

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Mr Wilson says he wants to see what difference this investment has made: for example, whether it has improved California's lamentable ranking in reading scores of ten-year-olds, in which it tied with Louisiana as the country's worst.

ECONOMIST: Mine! No, mine!