17. • Measures of Variation
Variance (V)
Standard Deviation (SD)
=
SD
Range = Hs – Ls
V
=
n (Tx2) –(Tx)2
n(n -1)
___
√V
18. For instance, considering the scores of two
groups of math major students as follows:
Group A
10
12
15
18
20
Group B
28
15
2
22
8
19. Example
Example. A random sample of 5
households in Bonifacio produced the
following estimates of viewing hours per
household:
3, 6.5, 12, 3.5, 5
Find the
Deviation
Variance
and
Standard
20. Sources:
Brase, C.H. & C. P. Brase.
Statistics.U.S.A.: D.C. Heath and Company.
(1987).
Understandable
Calano, R.B. & D.D. Cachuela. (2006). Statistics for the Health
Profession TextWorkbook.Philippines: EPH.
Ferguson, G. A.(1981). Statistical Analysis in Psychology and
Education.U.S.A: Mc Graw-Hill International Book Company.
Pfaffenberger R.C. & J.H. Patterson. (1987). Statistical Methods
for Business and Economics.U.S.A.:Automobila Quarterly Publications.
Subia, G.S. et.al. (2007). Basic Statistics Worktext-With Research
Applications and Probability. Ermita Manila: Educational Publishing House.
U.P.Statistical Center Research Foundation, Inc.and The School
of Statistics.(2005). Applied Statistics. U.P. Diliman,Quezon City.
