HP 33S, User Manual

Page: 355 / 388

Operation Index
G–3
File name 33s-English-Manual-040130-Publication(Edition 2).doc Page : 388
Printed Date : 2004/1/30 Size : 13.7 x 21.2 cm
Name Keys and Description Page
Σ
+
/
Accumulates ( y , x ) into
statistics registers.
11–2
Σ
–
¹ -
Removes ( y , x ) from
statistics registers.
11–2
Σ
x
º .
{  }
Returns the sum of x –values.
11–10 1
Σ
x
2
º .
{


}
Returns the sum of squares of
x –values.
11–10 1
Σ
xy
º .
{  }
Returns the sum of products of
x –and y –values.
11–10 1
Σ
y
º .
{  }
Returns the sum of y –values.
11–10 1
Σ
y
2 º .
{


}
Returns the sum of squares of
y –values.
11–10 1
σ
x
º +
{
σ

}
Returns population standard
deviation of
x –values:
n x x
i
÷ −
∑
2
) (
11–6 1
σ
y
º +
{
σ
 }
Returns population standard
deviation of
y –values:
n y y
i
÷ −
∑
2
) (
11–6 1
θ
, r y , x
º ±
Polar to rectangular coordinates .
Converts ( r ,
θ
) to ( x , y ).
4–9