HP HP-28S - Page 268

~Xy (Sum of Products of x and V)
Calculate I,xy, where the x's and y's are corresponding elements of C
1
and C
2
(the columns specified by the first and second parameters in
I,PAR).
Arguments
Program
. :~:
1 2
I:GET
I ENTER I
c:J ~Xy I STO I
Results
1: ~xy
Comments
Begin the program .
Specify C
1
and C
2
.
Extract I,xy.
End the program.
Put the program on the stack.
Store
the program as I,XY.
Example. Calculate I,X2, I,Y2, and I,XY for the following statistics
data:
18 12
4 7
3 2
11 1
31 48
20 17
28: Programming Examples 267