Statistical Summations; Standard Deviation - Monroe 770 Operating Instructions Manual

STATISTICAL SUMMATIONS
kX and kX2
Example
Compute !x and !x 2 for the following
values of x.
(12, 17,9, 10, 11,5, 14).
!x
= 78
!x
2
= 956
N
= 7
Instructions
Before beginning the calculations:
Depress .\.
Depress
~
Depress
x
For each value of x:
Set
12
(x) ..... Depress
t
Depress
=
Depress 1;
Repeat procedure for each value of x.
After last x:
Depress
t
Read
78
!x in display
Depress
~
Read
956
!x 2 in display
STANDARD DEVIATION
Example
Calculate
x
and S2 when !x
=
78
is
in storage
I
and !x
2
=
956
is in
storage
II.
N = 7
Formula
x
=
~
=
n.14285714
!x 2 _ (!X)2
S2
= ..
N.l N
=
14.47619051
Instructions
Depress
t
Depress:
Set
7.....
Depress
=
Read
11.14285714
Value ofx in display
Depress
x
Depress .\.
Depress
=
Depress"
Depress
~
Depress:
Set 6 .....Depress
=
Read
14.47619051
Value of S2 in display
To find value of S see procedure for
square root.
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