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 GreyMatter (ml) 2-5 yrHead Circumfer-ence z Scores at6-14 Months680-0.746901.8700-0.297200.267400.317402.17501.77502.67601.77801.77902.68102.78153.48202.88250.918352.958402.98452.8(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 1.9. (Give the answer to two decimal places.)

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Answered: The accompanying data on x = head…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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	-0.74
690	1.8
700	-0.29
720	0.26
740	0.31
740	2.1
750	1.7
750	2.6
760	1.7
780	1.7
790	2.6
810	2.7
815	3.4
820	2.8
825	0.91
835	2.95
840	2.9
845	2.8

(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 1.9. (Give the answer to two decimal places.)

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