HP 50G

Page 18-19
ΣX^2 : provides the sum of squares of values in Xcol column.
ΣY^2 : provides the sum of squares of values in Ycol column.
ΣX*Y: provides the sum of x⋅y, i.e., the products of data in columns Xcol and
Ycol.
NΣ : provides the number of columns in the ΣDATA matrix.
Example of STAT menu operations
Let ΣDATA be the matrix shown in next page.
Θ Type the matrix in level 1 of the stack by using the Matrix Writer.
Θ To store the matrix into ΣDATA, use: @)DATA „ @£DAT
Θ Calculate statistics of each column: @)STAT @)1VAR:
@TOT produces [38.5 87.5 82799.8]
@MEAN produces [5.5. 12.5 11828.54…]
@SDEV produces [3.39… 6.78… 21097.01…]
@MAX£ produces [10 21.5 55066]
@MIN£ produces [1.1 3.7 7.8]
L @VAR produces [11.52 46.08 445084146.33]
@PSDEV produces [3.142… 6.284… 19532.04…]
@PVAR produces [9.87… 39.49… 381500696.85…]
Θ Data:
Θ Generate a scatterplot of the data in columns 1 and 2 and fit a straight line
to it:
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550665.210.10
247439.192.9
22451.158.6
6125.125.5
259.52.2
1019.87.3
8.77.31.1