Question

in a quadratic regression problem, a graph is a perfect fit for the data when r = ?
a. 1
c. 2
b. 0
d. 100
please select the best answer from the choices provided
a
b
c
d

Explanation:

The correlation coefficient \( r \) measures the strength of linear association between variables, ranging from -1 to 1. A value of \( r = 1 \) indicates a perfect positive linear fit, which applies to perfect fits in regression contexts (including quadratic if the data aligns perfectly with the model).

Answer:

A. 1