A biostatistician reports a standard error of the mean for a sample. What does this value mainly describe?
Correct answer: B. The expected variation of sample means
- A. The spread of individual observations
- B. The expected variation of sample means
- C. The number of missing observations
- D. The percentage of diseased participants
Explanation
The standard error describes how much sample means are expected to vary from sample to sample. Standard deviation describes variation among individual observations, so confusing the two is a common error.
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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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