SAMPLINGASMA GUL

M.PHILLUNIVRSITY OF SARGODHA

OBJECTIVES

1- TO DEFINE SAMPLING AND TYPES OF SAMPLING

2-TO ENABLE THE STUDENTS TO EXPLAIN THE TYPES OF SAMPLING

POPULATION

ALL INDIVIDUALS WITH CERTAIN

SPECIFIED CHARACTERISTICS.

1

AN AGGREGATE OR UNIVERSE FROM WHICH A SAMPLE IS DRAWN CALLED POPOULATION

SAMPLE

SAMPLE IS THE PART OF THE POPULATION,

REPRESENTING THE CHARACTERISTICS OF THE WHOLE POPULATION.

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.

WHY SAMPLING

1-IMPOSSIBLE TO OBSERVE ALL EVENTS

2-TIME

3-COST

PROBABILITY SAMPLING

THIS IS ONE IN WHICH EACH PERSON IN THE

POPULATION HAS THE SAME PROBABILITY OF BEING SELECTED.

TYPES OF PROBABILITY SAMPLING

1- RANDOM SAMPLING

2-STRATIFIED SAMPLING

3-SYSTEMATIC SAMPLING

4- DOUBLE SAMPLING

NON PROBABILITY SAMPLING

SAMPLING IN WHICH SOME ELEMENTS OF POPULATION HAVE NO CHANCE OF

SELECTION.

TYPES OF NON PROBABILITY SAMPLING

1-CONVENIENCE SAMPLING

2-PURPOSIVE SAMPLING

3-QUOUTA SAMPLING

4-SNOW BALL SAMPLING

RANDOM SAMPLING

SELECTING SUBJECTS SO THAT ALL

MEMBERS OF A POPULATION HAVE AN

EQUAL AND INDEPENDENT CHANCE OF BEING SELECTED.

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…

SYSTEMATIC SAMPLING

SELECTING EVERY NTH SUBJECT FROM A LIST OF THE POPULATION..

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.

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

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.

CONVENIENCE SAMPLING

EASILY ACCESSIBLE SAMPLING.IN OTHER

WORDS THE SELECTION OF SAMPLE IS BASED ON THE AVAILABILITY OF SUBJECTS,

,VOLUNTEERS,PRE EXISTING GROUPS

PURPOSIVE SAMPLING

PURPOSIVE SAMPLING IS USED WHEN SELECTION OF SAMPLE IS BASED ON THE

RESEARCHER’S EXPERIENCE AND KNOWLEDGE OF

THE INDIVIDUALS BEING SAMPLED.

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..

SNOWBALL SAMPLING

SNOWBALL SAMPLING YOU BEGIN BY SOMEONE WHO MEETS THE CRITERIA FOR INCLUSION IN YOUR STUDY.

IN THIS SAMPLING POPULATION

IS NOT IDENTIFIED

THANKS

GOD BLESS U

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RANDOM TABLE