A distribution of household incomes has a long tail toward higher values because a few households have very high incomes. Which relationship is expected?
Correct answer: A. Mean is greater than median
- A. Mean is greater than median
- B. Mean is less than median
- C. Mean equals the mode
- D. Median equals the range
Explanation
A long right-sided tail pulls the mean toward the high values, so the mean is greater than the median. This is called positive or right skewness; the range is a measure of spread, not a central value.
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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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