Question

in a quadratic regression problem, a graph is a perfect fit for the data when r = ?
a. 1 \t\t\t\t\tc. 2
b. 0 \t\t\t\t\td. 100

please select the best answer from the choices provided

a
b
c
d

Explanation:

The correlation coefficient \( r \) measures how well data fits a regression model. A perfect fit (all data points lie exactly on the regression curve) corresponds to \( r = 1 \) (or \( -1 \) for negative linear relationships, but here 1 is the option). Values like 0 mean no correlation, 2 is outside the valid range (-1 to 1), and 100 is not a valid \( r \) value.

Answer:

A. 1