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 Months680-0.726901.5700-0.277200.287400.337401.87501.47502.37601.47801.47902.38102.48153.18202.58250.938352.658402.68452.5(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.) = _______

Given information: Cerebral GreyMatter (ml) 2-5 yr (X) Head Circumference z scores at6-14 Months…

Answered: The accompanying data on x = head…

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Author:Amos Gilat

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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	-0.72
690	1.5
700	-0.27
720	0.28
740	0.33
740	1.8
750	1.4
750	2.3
760	1.4
780	1.4
790	2.3
810	2.4
815	3.1
820	2.5
825	0.93
835	2.65
840	2.6
845	2.5

(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.)
= _______

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Step 1

Given information:

Cerebral Grey Matter (ml) 2-5 yr (X)	Head Circumference z scores at 6-14 Months (Y)
680	-0.72
690	1.5
700	-0.27
720	0.28
740	0.33
740	1.8
750	1.4
750	2.3
760	1.4
780	1.4
790	2.3
810	2.4
815	3.1
820	2.5
825	0.93
835	2.65
840	2.6
845	2.5

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