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Revised Data Collection Tools3-1-12

1 2 Table of Contents Introduction .. 3 Quantitative Data Collection Methods .. 4 Interviews .. 4 Telephone interviews .. 5 Face to face interviews .. 5 Computer Assisted Personal Interviewing (CAPI) .. 5 Questionnaires .. 5 Mail questionnaires .. 6 Web based questionnaires .. 6 Qualitative Data Collection Methods .. 7 In depth interviews .. 7 Observation methods .. 8 Document review .. 8 Focus groups .. 8 Summary of Survey Methods .. 9 Guidelines for Conducting a Focus Group .. 10 Validity and Reliability .. 13 Margin of Error .. 14 Nonsampling and Sampling Error .. 14 Margin of Error Defined .. 14 What Affects Margin of Error .. 14 Interpreting the Margin of Error .. 15 Strategies for Determining Sample Size.

data processing time. Disadvantages: The response rate is not as high as the face‐to‐face interview. The sample may be biased as only those people who have landline phones are contacted (excludes people who do not have a phone, or only have cell phones).

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