Question

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. Head Circumfer- Cerebral Grey ence z Scores at Matter (ml) 2-5 yr 6-14 Months 680 -0.73 690 1.6 700 -0.28 720 0.27 740 0.32 740 1.9 1.5 750 750 2.4 760 1.5 780 1.5 790 2.4 810 2.5 815 3.2 820 2.6 825 0.92 835 2.75 840 2.7 845 2.6

Answer 1

The detailed solution is given in the pictures below.

Please go through them carefully specially the notations.

Hope the solution helps. Thank you.

(Please do comment if further help is required)

1 (@) ra say Is no I where Say hist anh ta Sy ? + Edi g2 izl Here fa volume of matter (in mly and n= head circumference Z-score. We have n =18 we have n = 18 data on (ny) denoted as Flexortilizimin {niging, in Sesy and from data we get, p=0.75 Capprox.) Ans: 6.75 6 the least square regression line of given ý zatbr where b=p. Sy and a=g-bn from data, o = a= 713.13 Equation is y (6 we are to predict y using the previous equation when n=1.9. = 713.13 + 35.53 x 1.9 780,64 on a is 35.53, a = su 713.13 + 35.53 r. 그 at xalq Ans? 780.64.