Census and sample methods of data collection INVESTIGATION

Census and sample methods of data collection. INVESTIGATION COLLECTION OF DATA PRIMARY OR SECONDARY

COLLECTION OF DATA PRIMARY DATA CENSUS OR SAMPLE ORGANISATION OF DATA PRESENTATION OF DATA INTERPRETATION OF DATA

CENSUS SAMPLE

CENSUS RELAIABLE AND ACCURATE LESS BIASED EXTENSIVE INFORMATION STUDY OF DIVERSE CHARACTERISTICS STUDY OF COMPLEX INVESTIGATION INDIRECT INVESTIGATION COSTLY LARGE MAN POWER NOT SUITABLE FOR LARGE INVESTIGATION

S. N. BASIS CENSUS SAMPLING 1. COVERAGE INFORMATION FROM ALL ITEMS INFORMATION FROMSOME OF THE ITEMS 2. SUITABILITY AREA OF INVESTIGATION SMALL AREA OF INVESTIGATION LARGE 3. ACCURACY GREATER DEGREE OF ACCURACY LESS ACCURACY 4. COST MORE EXPENSIVE LESS EXPENSIVE 5. TIME MORE TIME CONSUMING LESS TIME CONSUMING 6. NATURE OF ITEMS DIVERSE CHARACTERISTICS HOMOGENEOUS 7. VERIFICATION GENERALLY NOT POSSIBLE CAN BE EASILY VERFIED

METHODS OF SAMPLING STRATIFIED PURPOSIVE RANDOM CONVENIENCE QUOTA SYSTEMATIC

RANDOM

CHOICE FLEXIBLE DELIBERATELY SIMPLE TECHNIQUE PURPOSIVE PERSONAL BIAS RELIABILITY DOUBTFUL

STRATIFIED OR MIXED SAMPLING POPULATION 51 SAMPLE 22 XI ECONOMICS XI D (38) (15) XI E (13) (7) BOYS 29(10) GIRLS 09(5) BOYS 02 (1) GIRLS 11 (6)

QUOTA SAMPLING

STATISTICAL ERROR SAMPLING ERROR 1. SIZE 2. NATURE OF SAMPLE SAMPLING ERROR = ESTIMATED VALUE OF PARAMETER –TRUE VALUE OF PARAMETER NON SAMPLING ERRORS 1. ERROR OF MEASUREMENT 2. ERROR OF NON – RESPONSE 3. ERROR OF MISINTERPRETATION 4. ERROR OF CALCULATION 5. ERROR OF SAMPLING BIAS.