16. Oh, that smarts! Infants who cry easily may be more
easily stimulated than others. This may be a sign of
higher IQ. Child development researchers explored
the relationship between the crying of infants 4 to
10 days old and their IQ test scores at age 3 years. A
snap
of a rubber band on the sole of the foot caused the
infants to cry. The researchers recorded the crying and
measured its intensity by the number of peaks in the
most active 20 seconds. The correlation for these data
is r = 0.45. Interpret the correlation.
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