15 20 25 30 (c) Find the sample correlation coefficient r and the coefficient of determination. (Round your answers to three decimal places.) r= 2²= What percentage of variation in y is explained by the least-squares model? (Round your answer to one decimal place.) % (d) If a female baby weighs 17 pounds at 1 year, what do you predict she will weigh at 30 years of age? (Round your answer to two decimal places.) lb
15 20 25 30 (c) Find the sample correlation coefficient r and the coefficient of determination. (Round your answers to three decimal places.) r= 2²= What percentage of variation in y is explained by the least-squares model? (Round your answer to one decimal place.) % (d) If a female baby weighs 17 pounds at 1 year, what do you predict she will weigh at 30 years of age? (Round your answer to two decimal places.) lb
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
Transcribed Image Text:130
120
110
10
15
20
25
30
X
130-
120
110
10
15
20
25
30
What percentage of variation in y is explained by the least-squares model? (Round your answer to one decimal place.)
%
X
(c) Find the sample correlation coefficient r and the coefficient of determination. (Round your answers to three decimal places.)
r=
2=
(d) If a female baby weighs 17 pounds at 1 year, what do you predict she will weigh at 30 years of age? (Round your answer to two decimal places.)
lb
Transcribed Image Text:Modern medical practice tells us not to encourage babies to become too fat. Is there a positive correlation between the weight x of a 1-year old baby and the weight y of the mature adult (30 years
old)? A random sample of medical files produced the following information for 14 females.
19
24
21
23
20
x (lb)
y (lb) 130 121 124 123 130 120
USE SALT
y =
b=
9=
Σχ = 294; Σy = 1,778; Σx2 = 6,308; Σy2 = 226,896; Σxy = 37,517
(a) Find x, y, b, and the equation of the least-squares line. (Round your answers for x and y to two decimal places. Round your answers for least-squares estimates to three decimal places.)
x=
160
(b) Draw a scatter diagram for the data. Plot the least-squares line on your scatter diagram.
y
150
140
130
15 25
145
120
21 17 24 26 22 18 19
130 130 130 130 140 110 115
110
y
160
150
T
140
130
120
110
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