Week 6.2 - Sampling & Experiments

Week 6.2 - Sampling & Experiments - Social Research...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Social’Research’Methods SOC’293 4’October’2012 Sampling’/’Experiments Sampling Quantitative Goal:’to’get’a’representative’sample’(able’to’generalize) Less’expensive’to’use’a’random’sample’then’to’try’to’collect’data’ on’entire’population Generally’use’probability’sampling’techniques’(but’not’always) Qualitative Goal:’illuminating’key’features’of’social’life Less’concerned’with’representativeness’and’more’concerned’ with’Fnding’cases’that’will’enhance’understanding Generally’use’non-probability’sampling’techniques Probability’Sampling:’Key’Terms Sampling Element :’unit’of’analysis’or’case’in’a’population’ that’is’being’measured.’(can’be’a’person,’an’ organization,’a’social’action,’etc.) Population: (or Universe) ’the’entire’pool’of’cases’from’which’ a’sample’is’drawn.’(see’box’6.1’on’page’146’for’ examples) Populations’have’geographic’and’temporal’bounds Probability’Sampling:’Key’Terms Target Population :’speciFc’pool’of’cases’that’a’researcher’ wishes’to’study. Sampling Ratio: the’ratio’of’the’size’of’the’sample’to’the’
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
size’of’the’target’population. Example: ’If’a’researcher’draws’a’sample’of’100’people’from’a’ population’of’500’people’the’sampling’ratio’is’20%’ (100/500=0.20,’or’20%) Probability’Sampling:’Key’Terms Sampling Frame :’a’researcher±s’operationalization’of’a’ population.’This’is’a’speciFc’list’that’closely’ approximates’all’the’elements’in’a’population. Some examples of sampling frames: Tax’Records Driver±s’License’Records Telephone’Directories Enrollment’/’Membership’Lists A’good’sampling’frame’is’crucial’to’good’sampling’but’it’is’ important’to’note’that’(except’for’a’few’speciFc’ populations)’sampling’frames’are’almost’always’ incomplete’or’slightly’inaccurate. Probability’Sampling:’Key’Terms Population Parameter :’any’characteristic’of’a’population’ (for’example:’the’percentage’of’UB’students’that’own’ mobile’phones).’ True’characteristic’of’a’population Determined’when’all’elements’in’a’population’are’measured Parameters’are’never’really’known’for’large’populations,’so’ researchers’estimate’them’on’the’basis’of’samples’ Statistic :’information’from’a’sample Probability’Sampling:’Key’Terms Sampling Distribution :’A’distribution’created’by’drawing’ many’random’samples’from’the’same’population’(see’ box’6.2’on’page’150’–’notice’the’bell’curve?)
Background image of page 2
Central LimitTheorem :’as’the’number’of’diFerent’random’ samples’in’a’sampling’distribution’increases’toward’
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 11

Week 6.2 - Sampling & Experiments - Social Research...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online