Select the statements that are true of the least-squares regression model.

(A) features known parameters representing the slope and intercept
(B) assumes that the mean response has a straight-line relationship with the explanatory variable x
(C) is defined in terms of two population parameters representing the slope and intercept
(D) predicts the mean response for each value of the explanatory variable x
(E) is based on sample data

step-by-step explanation:

compare

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.