What does a variance of a set of observations mainly describe?
Correct answer: C. The average squared deviation
- A. The most frequent observation
- B. The middle observation
- C. The average squared deviation
- D. The difference between extremes
Explanation
Variance measures the average of the squared deviations from the mean and describes dispersion. The mode is the most frequent value, the median is the middle value, and the range is the difference between the highest and lowest values.
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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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