Question

Question 4 1 pts Suppose a experiment is conducted to study the relationship between the percentage of a certain drug in the bloodstream (X) and the length of the time it takes to react to a stimulus (Y). The results are below. X 2 1 4 3 5 Y 1 1 2 2 4 z = 15, Ey=10, 22 = 55, y = 26, ry= 37. Find the coefficient of correlation between x and y. 0 -0.85 O 0.85 O 0.39 O 0.903 0 -0.903

Answer 1

Question 4

((N + ΣΧΥ) - ΣΧΣΥ)/((ΝΣ(Χ2) - (ΣΧ)2] (ΝΣ(Y2) – (ΣΥ)2)

$r = ( ( 5 * 37 ) - 15 * 10 ) / ( \sqrt{ ( 5 * 55 ) - ( 15 )^{2} )( 5 * 26 ) - ( 10 )^{2} })$
r = 0.903

Question 5
ß1 = $( n \Sigma XY - \Sigma X \Sigma Y) / ( n\Sigma X^{2} - (\Sigma X)^{2})$
ß1 =
ß1 = 0.70

Question 6

((N + ΣΧΥ) - ΣΧΣΥ)/((ΝΣ(Χ2) - (ΣΧ)2] (ΝΣ(Y2) – (ΣΥ)2)

$r = ( ( 7 * 1916 ) - 337 * 44 ) / ( \sqrt{ ( 7 * 18563 ) - ( 337 )^{2} )( 7 * 296 ) - ( 44 )^{2} })$
r = - 0.95

Question 7

ß1 = $( n \Sigma XY - \Sigma X \Sigma Y) / ( n\Sigma X^{2} - (\Sigma X)^{2})$
ß1 =
ß1 = - 0.086

Question 8

- Ba BK