Boys with many girl friends in their friendship circle performed better at
school than boys who only had male friends (The
Economist, August 8, 2015). The same 1995 study revealed no link between
the number of male friends girls at high school had and their school grades.
However, a University of South Carolina study published in the American Economic Journal: Applied Economics
(July 2015) called ‘The girl next door: The effect of opposite gender friends
on high school achievement’ reveals a different result.
Andrew Hill of USC wanted to eliminate any possible bias in the study (e.g.
parents choosing friends for their children), so instead of looking at the
number of opposite-gender friends, he looked at the proportion of shoolmates of
either sex living near each student being surveyed. The rationale was that
parents do not choose where to live based on the gender of their neighbour’s
children. The neighbourhood method was likely to take out the bias, but still
be relevant because children are more likely to be friends with other children
who live close to them.
Hill selected 20 closest neighbours for each of the 450 high school students
in the research survey. He then isolated the effects of having more friends of
the opposite gender on school performance, taking each student’s grades.
He found that for every 10% more children of the opposite sex among a
student’s friendship circle, the student’s grade-point average (GPA) declined
by 0.1 (GPAs range from 0 to 4). Therefore if a student (male or female) had 10
friends of the opposite gender, they would score 1 GPA less than students who had
less friends of the opposite gender.
Below the age of 16 years, the effects of having more opposite-gender
friends are restricted to science and mathematics grades only. Beyond 16 years,
the effects of declining grades were seen in English and history grades too. So
more friends of the opposite gender, the lower the school grades.
But there were advantages of having several opposite-gender friends during
high school. Hill’s original group of 14 years ago were re-interviewed. And
Hill found that the more opposite-gender friends, the more likely that the
student was or had been married.
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