Refer to Exercise 16. Does the fact that r = 0.45 suggest that making an infant cry will increase his or her IQ later in life? Explain your reasoning.

Exercise 16.

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 = 0.45.16 Interpret the correlation.

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180 170- 160- 150- 140 130 120 110 100 - 90 80 70 5 10 15 20 25 30 35 40 Count of crying peaks IQ at age 3 years