Unit 3

Mean = Median = Mode

Mean is greater than the median

Mean is less than the Median

• Measures of Variation

Range = Hs – Ls

Variance (V)

Standard Deviation (SD)

V = n (Tx2) –(Tx)2

n(n -1) ___

SD = √ V

For instance, considering the scores of two groups of math major students as follows:

Group A Group B 10 28 12 15

15 2

18 22 20 8

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 Variance and Standard

Deviation

Example

Sources:

Brase, C.H. & C. P. Brase. (1987). Understandable Statistics.U.S.A.: D.C. Heath and Company.

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.