In a survey, the probability of selecting a household is 0.2. What does this probability mean?
Correct answer: C. Each household has a 20% selection chance
- A. Two households must be selected
- B. Twenty households are already selected
- C. Each household has a 20% selection chance
- D. The survey has a 20% response rate
Explanation
A probability of 0.2 is equivalent to a 20% chance of selection for that household. It does not describe the number selected or the proportion who respond.
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About Epidemiology and Biostatistics
Epidemiology examines the distribution and causes of disease by person, place and time, using measures such as incidence, prevalence, mortality and case-fatality rates. Biostatistics covers data presentation, sampling, averages, variability, probability and interpretation of study results, while distinguishing association from causation.
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