A data set contains one extremely high value caused by a recording error. Which measure of central tendency is least affected by that extreme value?
Correct answer: B. Median
- A. Mean
- B. Median
- C. Arithmetic average
- D. Weighted mean
Explanation
The median is based on the middle position and is less influenced by extreme observations. The mean and other arithmetic averages can be pulled substantially toward an unusually high or low 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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