The accompanying data on x = head crcumference z score (a comparison score with

Question

The accompanying data on x = head crcumference z score (a comparison score with peers of the same age-a positive score suggests a larger size than for peers) at age 6 to 14 months and y volume of cerebral grey matter (in ml) at age 2 to 5 years were read from a graph in an article Head Circumfer- ence z Scores at Cerebral Grey Matter (ml) 2-5 yr 6-14 Months 680 690 700 0.73 1.6 0.28 0.27 0.32 750 750 760 780 790 810 815 820 1,5 2.4 2.5 3.2 2.6 0.92 2.75 2.7 2.6 835 840 845 (a) What is the value of the correlation coefficient? (Give the answer to two decimal places.) (b) Find the equation of the least-squares line. (Give the answer to two decimal places.) (e) Predict the volume of cerebral grey matter for a child whose head 1.7. Give the answer to two decimal places.) e z score at age 12 months was

Explanation / Answer

(a)Correlation coefficient=0.75

(b)Equation of the least square line:y = 35.53x + 713.13

(c)Volume of grey cerebral matter if head circumference is 1.7=773.53

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