Hi!
Ive been given two questions I really dont understand. The first one is:
Prove that: Sum of (Xi - x-bar)(Y1- Y-bar) = Sum of X1 (Y1 - Y-bar)
The other one is
Prove that:
Sum of (X1 - x-bar)2 = Sum of X1(X1 - x-bar)
With the second one i wondered if it based on the X-bar being (Sum of X)/n so rewriting it means:
X(X- Sum of X/n) ---> X2 - (Sum of X)2 /n
But it dosent seem correct when I apply it to real numbers. Please help me with this!
Thank you!
Ive been given two questions I really dont understand. The first one is:
Prove that: Sum of (Xi - x-bar)(Y1- Y-bar) = Sum of X1 (Y1 - Y-bar)
The other one is
Prove that:
Sum of (X1 - x-bar)2 = Sum of X1(X1 - x-bar)
With the second one i wondered if it based on the X-bar being (Sum of X)/n so rewriting it means:
X(X- Sum of X/n) ---> X2 - (Sum of X)2 /n
But it dosent seem correct when I apply it to real numbers. Please help me with this!
Thank you!