A nurse wants to display the number of patients in different blood groups at a health centre. Which graph is most suitable?
Correct answer: A. Bar graph
- A. Bar graph
- B. Histogram
- C. Scatter plot
- D. Line graph
Explanation
Blood group is a categorical variable, so separate bars can compare the number in each category. Histograms are used for continuous numerical data, while scatter plots examine relationships between two numerical variables.
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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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