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 680 690 700 720 740 740 750 750 760 780 790 810 815 820 825 835 840 845 (a) What is the value of the correlation coefficient? (Give the answer to two decimal places.) -0.65 1.4 -0.20 0.35 0.40 1.7 1.3 2.2 1.3 1.3 2.2 2.3 3.0 2.4 1.00 2.55 2.5 2.4 (b) Find the equation of the least-squares line. (Give the answer to two decimal places.) ŷ = (c) Predict the volume of cerebral grey matter for a child whose head circumference z score at age 12 months was 1.8. (Give the answer to two decimal places.)
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 680 690 700 720 740 740 750 750 760 780 790 810 815 820 825 835 840 845 (a) What is the value of the correlation coefficient? (Give the answer to two decimal places.) -0.65 1.4 -0.20 0.35 0.40 1.7 1.3 2.2 1.3 1.3 2.2 2.3 3.0 2.4 1.00 2.55 2.5 2.4 (b) Find the equation of the least-squares line. (Give the answer to two decimal places.) ŷ = (c) Predict the volume of cerebral grey matter for a child whose head circumference z score at age 12 months was 1.8. (Give the answer to two decimal places.)
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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Related questions
Question

Transcribed Image Text: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
690
700
720
740
740
750
750
760
780
790
810
815
820
825
835
840
845
(a) What is the value of the correlation coefficient? (Give the answer to two decimal places.)
r =
-0.65
1.4
-0.20
0.35
0.40
1.7
1.3
2.2
1.3
1.3
2.2
2.3
3.0
2.4
1.00
2.55
2.5
2.4
(b) Find the equation of the least-squares line. (Give the answer to two decimal places.)
ŷ =
(c) Predict the volume of cerebral grey matter for a child whose head circumference z score at age 12 months was 1.8. (Give the answer to two decimal
places.)
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