In a multiple regression based on 30 observations,the following information is provided: 
with 
.Also, 
evaluated at 
and 
is 2.8.
A)Construct a 95% confidence interval for 
if x1 equals 40 and x2 equals 30.
B)Construct a 95% prediction interval for y if x1 equals 40 and x2 equals 30.
C)Which interval is narrower? Explain.
Definitions:
Foramen Ovale
An opening in the septum between the two atria of the heart in the fetus, which normally closes after birth.
Inferior Vena Cava
The inferior vena cava is a large vein that carries deoxygenated blood from the lower and middle portion of the body to the right atrium of the heart.
External Iliac Vein
A large vein in the pelvis that carries deoxygenated blood from the lower limbs back to the heart.
Superior Vena Cava
A large vein that carries deoxygenated blood from the upper half of the body to the heart's right atrium.
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