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Types of Data - TypesofData Primary Secondary PrimaryData...

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Types of Data Primary Secondary
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Primary Data Survey Questionnaires Interviews Telephone Inquiries
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Primary Data Observation Experimentation
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Data Collection Errors A sample size that is too small Sample that is not representative of the  population Information from biased sources Poorly constructed survey instrument
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Sample Size Population Sample Size 100 80 500       217   1,000       285      5,000       357     10,000       370     50,000       381 1,000,000       384
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Sampling Methods Random (Convenience) Sample Systematic Random Sample Stratified Random Sample
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Random Sample People are selected at random without  any system or pattern.
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Systematic Random Sample Selecting every nth person from a  population.
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Stratified Random Sample Identify the key characteristics of the  study, and match those characteristic in  the sample population in the same  proportion as they exist in the overall  population.
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Types of Survey Questions Dichotomous Multiple Choice Check List Rank Order Likert Scale Open ended
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Dichotomous Question The respondent only gets two options Gender  ____Male or ____Female _____Yes  or _____No 
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Multiple Choice Question The respondent gets three or more options ___Yes  ___No ___Maybe ___less than $5 ___$5 - $10 ___more than $10
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Check List Question The respondent can select more than  one option from a number of options.
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