A researcher wants to show the distribution of patients' haemoglobin values across continuous intervals. Which display is most appropriate?
Correct answer: A. Histogram
- A. Histogram
- B. Pie chart
- C. Bar chart of blood groups
- D. Line list of patient names
Explanation
A histogram displays the frequency distribution of continuous numerical data across intervals. Pie charts and ordinary bar charts are more suitable for categorical data, while a line list is a record rather than a summary graph.
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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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