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Help with calculating errors and slope in Fortran 90.

Writing a fortran program to find errors in a and b?
I am writing a program to calculate the y-intercept, best slope and the errors in a and b. I have been able to write up until the errors, which is where im struggling. This is what i've done so far:

PROGRAM assignment4
INTEGER :: i,n
REAL :: sumx, sumy, sumxx, sumxy, a, b, e, f
REAL :: sumax, sumb, sumyi, sumd
REAL :: x(100),y(100)
PRINT*,"How many points to be entered(Max 100)?"
PRINT*,"Enter the data pairs,x,y"
DO i=1,n
DO i=1,n
Sumx= sumx+x(i)
Sumy= sumy+y(i)
Sumxx= sumxx+x(i)**2
Sumxy= sumxy+x(i)*y(i)
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