Sampling and Data Collection
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Transcript of Sampling and Data Collection
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Sampling and Data Collection
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Population, Census and Sample“The aggregate of all the elements sharing some common sets of characters” is Population in percentage“ Complete enumerations of the elements of a population” is census“ Subgroup of the element's of a population selected for the study is sample.
Area (Population) like All Working Class employees, Classification of area (Census) Middle /Top Management, Public/ Private, Classification selected from area (Sample) in banks
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Target Population, Element, Unit & Sample FrameTarget Population- whose inference has to be made.
Element- which possesses the information sought by researcher.
Sample Unit- units containing the elements to be sampled.
It is a kind of list or set of directions for identifying the target population.
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Classification of Sampling
Non- Probability Probability1. Quota Simple Random2. Judgment Stratified Random3. Snow Ball Cluster4. Convenience Systematic
Random5. Area 6.
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Graphical representation of NP Sampling 1. Convenience Sampling
Group C assembles at most convenient time hence considered by researcher.
A B C D E1 7 13 20 26
2 8 14 21 27
3 9 15 22 28
4 10 16 23 29
5 11 17 24 30
6 12 18 25 31
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2. Judgmental
Researcher considered group A, C, D and E, eliminating group B based on some typicality's and Convenient few characters were selected.
A B C D E
1 5 9 13 17
2 6 10 14 18
3 7 11 15 19
4 8 12 16 20
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Quota Sampling
A quota of one element is imposed on each group with similar characters.
A B C D E1 6 11 16 212 7 12 17 22
3 8 13 18 23
4 9 14 19 24
5 10 15 20 25
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Snow-Ball
TO STUDY SPECIAL CHARACTERS OF RESPONDENTS. GENERALLY USED TO STUDIE SPECIAL BEHAVIORAL CASUSES.
A B C D E1 6 11 16 21
2 7 12 17 22
3 8 13 18 23
4 9 14 19 24
5 10 15 20 25
12 &13
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Probability Sampling-Simple Random Sampling Simple Random
A B C D1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
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Stratified Sampling
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How to Determine Sample Size
Initially it is required to know about certain symbols and characters to determine sample size like:1. Parameter- description of fixed Characters like consumers2. Statistics- description of fixed characteristics or measures
like consumers, consuming touch screen mobile phones3. Precision level- maximum permissible level of difference
between sample statistics and Population parameter4. Confidence interval- range in which true population
parameter will fall5. Confidence level- probability that interval will include the
population parameter
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Source of Data Collection Secondary Data
Internal External
Primary Data
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Primary Data Observation Method
Natural Vs Contrived Open Vs Disguised Structured Vs Unstructured . Direct Vs Indirect Mechanical Vs Human Non- Behavioral Vs Behavioral
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Questionnaires steps1. Information2. Type of questionnaire3. Method of administration4. Form of response5. Phrasing of questions6. Sequence of questions
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Interviews
Depth individual depth focused group
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Essentials of Questionnaires
“ Basic thing which questionnaire must contain is clearly spelt out research objectives”
“These Objectives are to be able to get converted into Questions”.
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Formalized Non-Formalized
Unconcealed
Concealed
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Types of QuestionnaireFormalized and Unconcealed It is widely used by Marketing Researchers. They are Structured so as easy to administer, Self-explanatory in nature.Second advantage of such type of questionnaire is that they can be easily administer to a large number of population at the same time.They cover the points in step wise step process.
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Formalized and Concealed It tries to explain latent Cause of Behavior, which on other-hand can not be derived by direct Questions. It actually Maps the basic values, opinion and beliefs of one.The intention behind developing such questionnaire is not to threaten any respondent providing general directions for answering the questions.They are structured hence helps in quantifying the statically data, also increases the subjectivity of data and improve the validity of scale as well.
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Non-Formalized and Unconcealed It allows respondent to answer his/her attitude in very liberated way and uninhabited manner. They are more useful to researchers if arranged in unstructured way.The biggest advantage is that it allows respondent to answer in way he/she feel is important hence provides multiple options and comprehensive perspectives for solution one is looking forward from such research.
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Non-Formalized and Concealed
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PROCESS OF DESIGNING
Convert Objectives
into Information
How to administer
questionnaire
Content of questionnaire
Motivating respondent to answer
Determine types of
questionnaire
Administering questionnaire
Pilot testing
Presentation of
questionnaire
Determine questionnaire
structure
Criterion of questions design
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DETERMINING TYPE OF QUESTIONANNIRE
QuestionContent
Open-Ended
Closed Ended
Dichotomous MultipleResponse Scales
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Criteria for Designing Clearly specify the issue Use simple terminology Avoid ambiguity Avoid loaded questions avoid double barreled questions