HP -22S Owner's Manual page 83

Statistical Functions* (Continued)
Function
Description Typing Aid
T-y Sum of the y-values.
1
STAT I {Z} {y}
T-y2
Sum of the squares of the y-
1
STAT I {Z} {)'2}
values.
X Arithmetic mean (average) of
1
STAT I {x,y} {x}
the x-values.
x(y)
Estimates the x-value for the
1 STAT I {loR.}
{~}
given value of y, using the line
calculated by linear
regression.
xw Weighted mean of the x-val-
1
STAT I {x,y} {xw}
ues weighted according to the
y-values.
y
Arithmetic mean (average) of 1 STAT I {x,y} {y}
the y-values.
y(x) Estimates the y-value for the 1 STAT I {loR,} {y}
given value of x, using the line
calculated by linear
regression .
• The statistical functions use the data stored in the statistical registers.
Unit-Conversion Functions
Function Conversion
Typing Aid
°C(x) Degrees Fahrenheit to de-
. 1
UNITS I {TMP}
{~DC}
grees Celsius.
CM(x) Inches to centimeters.
. 1
UNITS I {L}
{~CM}
°F(x) Degrees Celsius to degrees
. 1
UNITS I {TMP}
{~D
F}
Fahrenheit.
GAL(x) Liters to U.S. gallons.
. 1
UNITS I {VOL}
{~GAL}
IN(x) Centimeters to inches.
.'UNITSI {L} {~IN}
KG(x) Pounds to kilograms.
.'UNITSI {M} {~KG}
LTR(x) U.S. gallons to liters.
. , UNITS I {VOL}
{~L
TR}
LB(x) Kilograms to pounds.
. , UNITS I {M} ULB}
6: Evaluating and Solving Equations 83