Question

What is the r-value of the following data to three decimal places?

A. -0.811
B. 0.811
C. 0.901
D. -0.901

Answer 1

-0.9007 it would be D. if I'm right

Explanation:

X Values

∑ = 34

Mean = 6.8

∑(X - Mx)2 = SSx = 140.8

Y Values

∑ = 54

Mean = 10.8

∑(Y - My)2 = SSy = 164.8

X and Y Combined

N = 5

∑(X - Mx)(Y - My) = -137.2

R Calculation

r = ∑((X - My)(Y - Mx)) / √((SSx)(SSy))

r = -137.2 / √((140.8)(164.8)) = -0.9007

Meta Numerics (cross-check)

r = -0.9007