Answer to Question 1
Personal interviews imply a direct face-to-face conversation between the interviewer and the respondent, as opposed to telephone interviews. In both types, the interviewer asks the questions and records the respondents' answers, either while the interview is in progress or immediately afterward. Mail questionnaires are sent to designated respondents with an accompanying cover letter. The respondents complete the questionnaire at their leisure and mail their replies back to the research organization. Internet-based questionnaires involve either e-mails sent to respondents, who in turn reply to the e-mail with their answers, or surveys that are completed by respondents via the Web.
Answer to Question 2
random-digit dialing
Teaching methods based on patients developmental capacity
Research Methods
Neural Basis of Enhancement of Contrast
Cross-Sectional and Longitudinal Methods
Plant foods such as grains and vegetables are the main sources of nonheme iron in your diet
Research Methods