Answer:
See proof below.
Step-by-step explanation:
If we assume the following linear model:
And if we have n sets of paired observations 
the model can be written like this:
And using the least squares procedure gives to us the following least squares estimates 
for 
and 
for 
:
Where:
Then 
is a random variable and the estimated value is 
. We can express this estimator like this:
Where 
and if we see careful we notice that 
and 
So then when we find the expected value we got:
And as we can see is an unbiased estimator for
In order to find the variance for the estimator we have this:
And we can assume that 
since the observations are assumed independent, then we have this:
And if we simplify we got:
And with this we complete the proof required.
Area = base * height. This is because you can move the triangle on the left to the right side, forming a rectangle, which has an area of base * height.
For this shape, the area is 2.8m * 6.2m = 17.36 m^2. I don't see that answer listed, nor are the answers in m^2, which is strange.
Step-by-step explanation:
<h3>4²=16</h3>
5²=25
25-16=9
9 is an odd number.
