question 23
Given a data with y as a response variable and x1,x2, and x3 as
explanatory variable, a regression equation relates y to x1 and
another relates y to x1,x2, and x3. Calculate the first degree of
freedom df1 for testing
H0:β2=β3=0,HA:β2≠0orβ3≠0.
A. 1
B. 2
C. 3
D. 4
question 25
The following table shows the output of a regression model to
explain SAT math scores.
Coefficient
Standard Error
T Stat
p-value
Intercept
650.11
117.42
5.54
0.000
x...