Answer to Question 1
sampling frame
Answer to Question 2
Mail questionnaires - Advantages are easy, inexpensive, cover a wide geographical area, can be done at respondents convenience, anonymity and limit interviewer bias. Disadvantages are low response rate, people who respond are not representative, no control over conditions of completion, limits types of questions.
Telephone - Advantages are can reach about 95 of population by phone, use of random-digit dialing, wide geographical area, short turn-around time, can use probes. Disadvantages are higher cost, limited interview length, respondent is not available by phone, potential interviewer bias Face-to-face - Advantages are highest response rates and longest questionnaires, interviews can observe nonverbal communication, extensive probes. Disadvantages are training, travel supervision and personnel costs of interviews, interviewer bias, limited geographical area. Web survey - Advantages ae lowest cost, quick answers, span geographic areas and include visual media. Disadvantages are that not everyone has computer or internet access, low response rate,
can't control conditions under which the respondent takes the survey.
Embryonic and Induced Pluripotent Stem Cells & Lineage-specific Markers
Table 6.1 illustrates the main regime types and their differences. It breaks the regimes into four
Basic principle of target-probe hybridization in microarray chips.
Population Density
Population: Historic Patterns
The fire triangle and the fire tetrahedron For combustion to occur, three elements must be ...