Question
The accompanying data on x = head circumference z score (a comparison score with peers of the same age - a positive score suggests a
The accompanying data on x = head circumference 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.
Cerebral Grey Matter (ml) 2-5 yr | Head Circumfer- ence z Scores at 6-14 Months |
680 | -0.72 |
690 | 1.6 |
700 | -0.27 |
720 | 0.28 |
740 | 0.33 |
740 | 1.9 |
750 | 1.5 |
750 | 2.4 |
760 | 1.5 |
780 | 1.5 |
790 | 2.4 |
810 | 2.5 |
815 | 3.2 |
820 | 2.6 |
825 | 0.93 |
835 | 2.75 |
840 | 2.7 |
845 | 2.6 |
(a) What is the value of the correlation coefficient? (Give the answer to two decimal places.) r = (b) Find the equation of the least-squares line. (Give the answer to two decimal places.) =
(c) Predict the volume of cerebral grey matter for a child whose head circumference z score at age 12 months was 1.7. (Give the answer to two decimal places.)
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