1. ASMA GUL
M.PHILL
UNIVRSITY OF SARGODHA

2. OBJECTIVES
1- TO DEFINE SAMPLING AND TYPES OF SAMPLING
2-TO ENABLE THE STUDENTS TO EXPLAIN THE
TYPES OF SAMPLING

3. POPULATION
 ALL INDIVIDUALS WITH CERTAIN
SPECIFIED CHARACTERISTICS.
 AN AGGREGATE OR UNIVERSE FROM WHICH
1
A SAMPLE IS DRAWN CALLED POPOULATION

4. SAMPLE
SAMPLE IS THE PART OF THE POPULATION,
REPRESENTING THE CHARACTERISTICS OF THE
WHOLE POPULATION.

5. SAMPLING
THE PROCESS OF SELECTING A SAMPLE FROM
THE POPULATION IS CALLED SAMPLING.IT CAN BE
DIVIDED INTO TWO PARTS PROBABILITY SAMPLING
AND NON PROBABILITY SAMPLING.

6. WHY SAMPLING
1-IMPOSSIBLE TO OBSERVE ALL EVENTS
2-TIME
3-COST

7. PROBABILITY SAMPLING
THIS IS ONE IN WHICH EACH PERSON IN THE
POPULATION HAS THE SAME PROBABILITY OF
BEING SELECTED.

8. TYPES OF PROBABILITY SAMPLING
1- RANDOM SAMPLING
2-STRATIFIED SAMPLING
3-SYSTEMATIC SAMPLING
4- DOUBLE SAMPLING

9. NON PROBABILITY SAMPLING
SAMPLING IN WHICH SOME ELEMENTS OF
POPULATION HAVE NO CHANCE OF
SELECTION.

10. TYPES OF NON PROBABILITY SAMPLING
1-CONVENIENCE SAMPLING
2-PURPOSIVE SAMPLING
3-QUOUTA SAMPLING
4-SNOW BALL SAMPLING

11. RANDOM SAMPLING
SELECTING SUBJECTS SO THAT ALL
MEMBERS OF A POPULATION HAVE AN
EQUAL AND INDEPENDENT CHANCE OF
BEING SELECTED.

12. STRATIFIED SAMPLING
Stratified sampling is a process in which certain
subgroups or strata, are selected for the sample in
the same proportion as they exist in the
population…

13. SYSTEMATIC SAMPLING
SELECTING EVERY NTH SUBJECT FROM A
LIST OF THE POPULATION..

14. SELECTION PROCESS
1-IDENTIFY AND DEFINE THE POPULATION.
2-DETERMINE THE DESIRED SAMPLE SIZE.
3-OBTAIN A LIST OF THE POPULATION AND
ASSAIGN ASCENDING ORDER NUMBERS TO
EACH MEMBER.
4-START AT SOME RANDOM PLACE IN THE
POPULATION LIST.

15. DOUBLE SAMPLING
IF THERE IS NOT A CLEAR
ACCEPT / REJECT DECISION
FROM INSPECTION OF THE FIRST
SAMPLE ,A SECOND SAMPLE IS
TAKEN AND THE DECISION IS
MADE BASED ON THE RESULTS
OF THE COMBINED SAMPLES

16. CLUSTER SAMPLING
THE SELEDCTION OF GROUPS OF INDIVIDUALS
CALLED CLUSTERS,RATHER THAN
SINGLE INDIVIDUAL. ALL INDIVIDUALS IN A CLUSTER
ARE INCLUDED IN THE SAMPLE.,THE CLUSTERS ARE
PREFERABLY SELECTED RANDOMLY FROM LARGEER
POPULATION OF CLUSTER.

17. CONVENIENCE SAMPLING
EASILY ACCESSIBLE SAMPLING.IN OTHER
WORDS THE SELECTION OF SAMPLE IS BASED
ON THE AVAILABILITY OF SUBJECTS,
,VOLUNTEERS,PRE EXISTING GROUPS

18. PURPOSIVE SAMPLING
PURPOSIVE SAMPLING IS USED WHEN SELECTION
OF SAMPLE IS BASED ON THE
RESEARCHER’S EXPERIENCE AND KNOWLEDGE OF
THE INDIVIDUALS BEING SAMPLED.

19. QUOTA SAMPLING
QUOTA SAMPLING IS USED WHEN
SELECTION OF SAMPLE BASED ON THE EXACT
CHARACTERISTICS AND QUOTAS OF SUBJECTS
AND IT IS IMPOSSIBLE TO LIST ALL MEMBERS
OF POPULATION..

20. SNOWBALL SAMPLING
SNOWBALL SAMPLING YOU BEGIN BY
SOMEONE WHO MEETS THE CRITERIA
FOR INCLUSION IN YOUR STUDY.
IN THIS SAMPLING POPULATION
IS NOT IDENTIFIED

21. THANKS
GOD BLESS U

22. RANDOM TABLE
22592 44213 32464 67712 35409 79203 47822
68521 79866 72389 94820 27528 55963 70658
73457 91616 37141 27123 83734 87343 49959
62112 99093 14710 94416 55299 46090 47159
43954 53567 24728 37805 51690 83475 35005
33532 64508 45022 50363 34341 82407 38209
97361 93347 58504 36477 75998 57435 39682
66385 86275 53163 52499 27932 28191 80530
96956 21119 75189 12978 73053 19387 53827
77066 54231 49295 37545 72794 67049 10842
79462 00161 11506 04029 26460 59167 61044
02297 05097 23255 68780 32205 88816 18983
81598 93752 30732 46350 26055 86939 77730
78798 75594 85207 56367 42886 56772 15115
66644 38614