STAT 1100 Chapter Notes - Chapter 5: Sampling Error, Simple Random Sample, Statistical Inference
Document Summary
Section 1 methods of collecting data. Observational: obtaining data by direct observation: disadvantage: it is difficult to produce useful information in this way, advantage: it is relatively inexpensive. Experimental: producing data through experiments (more expensive) Survey: solicits information from people concerning such things as their income, family size, and opinions on various issues. Response rate: the proportion of all people who were selected who complete the survey: a low response rate can destroy the validity of any conclusion. Telephone interview: usually less expensive, less personal and has a lower expected response rate. Self-administered survey: usually mailed to a sample of people; inexpensive method; usually have a low-response rate and a relatively high number of incorrect responses due to misunderstandings. Questionnaire design; basic points to consider regarding questionnaire design. : 1. Be kept as short as possible: 2. Should be simple and clear worded: 3. Often begin with simple demographic questions to help respondents get started and become comfortable quickly: 4.
