3_Measures of Central Tendency, Dispersion and Skewness

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Learning Statistics the Easy Easy Way Way Session on

MEASURES OF CENTRAL TENDENCY,

BUREAU OF LABOR AND EMPLOYMENT STA STATISTICS

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MEASURES OF CENTRAL TENDENCY, DISPERSION AND SKEWNESS

OBJECTIVES At the end of the session, the participants should be able to:

. central tendency; 2

escr escrib ibe e data data in term termss o thei theirr vari variab abil ilit it and skewness; and

3. De Determine ine th the mo most a lica icable measu asure of of









OUTLINE

Mean Mode . 3. Skewness









Measu asures o Central Tendenc A. MEAN - commo commonl nlyy refer referre red d to as the the aver average age or or arith arithme metic tic mean. - most most wid widely ely used used mea measur sure e of cen centr tral al loca locatio tion. n.









Measures of Central Tendency Ages of 13 Job Applicants Example of mean computation Mean A e X

= 30+28+…+25 = 318/13

Applicant Number

Age

1

30

3

25

4

35

6

34

7

20

8

19

9

26

10

18









Mea Measure suress o Cen Centra tral Ten Tende denc nc B. MEDIAN - the the val value ue of the the midd middle le ite item m in a set set of ascending or descending order of magnitude. - s

e cen ermos va ue n a

s r u on.











Measures of Central Tendency Ages of 13 Job Applicants

median (Number of observations is odd)

Applicant Number

Age

12

16

The median value is the middle most value in the data











Measures of Central Tendency Ages of 14 Job Applicants

Example of finding the median (Number of observations is even)

Applicant Number

Age

12

16

11

17

The median value is the sum of the two middle











Mea Measure suress o Cen Centra tral Ten Tende denc nc C. MODE - is the value in the data set that

Ages of 13 Job Applicants Applicant um er

Age

12

16











Mea Measure suress o Cen Centra tral Ten Tende denc nc Advantages of the MEAN: . 

can be used for further statistical calculations and











Measures of Central Tendenc Advantages of the MEDIAN: 

not affected by extreme values.





































































































































3_Measures of Central Tendency, Dispersion and Skewness

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