Free Epidemiology and Biostatistics MCQs with Answers
50 Epidemiology and Biostatistics MCQs from Community Health Nursing, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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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50 questions · page 3 of 3
- A. Sporadic occurrence
- B. Endemic occurrence
- C. Epidemic occurrence
- D. Pandemic occurrence
Explanation: Sporadic disease occurs infrequently and irregularly, with isolated cases.
Correct answer: Sporadic occurrence- A. Total population
- B. Total live births
- C. Total pregnancies
- D. Total infant deaths
Explanation: Infant mortality rate uses the number of deaths among infants younger than one year divided by the number of live births in the same…
Correct answer: Total live births- A. Cancer-specific mortality rate
- B. Proportional mortality percentage
- C. Case-fatality percentage
- D. Maternal mortality ratio
Explanation: Proportional mortality percentage describes deaths from one cause as a proportion of all deaths.
Correct answer: Proportional mortality percentage- A. The most frequent observation
- B. The middle observation
- C. The average squared deviation
- D. The difference between extremes
Explanation: Variance measures the average of the squared deviations from the mean and describes dispersion.
Correct answer: The average squared deviation- A. Scatter diagram
- B. Pie chart
- C. Bar chart
- D. Frequency polygon
Explanation: A scatter diagram displays paired values for two quantitative variables and helps show their relationship.
Correct answer: Scatter diagram- A. 0.18
- B. 0.28
- C. 0.72
- D. 1.72
Explanation: The probability of an event not occurring is calculated as 1 minus the probability of its occurrence.
Correct answer: 0.28- A. Purposive sampling
- B. Simple random sampling
- C. Systematic sampling
- D. Cluster sampling
Explanation: Purposive sampling deliberately selects people who meet characteristics relevant to the research question.
Correct answer: Purposive sampling- A. Random allocation to groups
- B. Collection of data in one month
- C. Use of a large questionnaire
- D. Selection of a rural setting
Explanation: Random allocation helps balance known and unknown confounding factors between groups, strengthening the evidence that the intervention…
Correct answer: Random allocation to groups- A. The exposure occurred before illness
- B. The families live in one district
- C. The illness was recorded by nurses
- D. The participants had similar ages
Explanation: Temporality requires the suspected cause to occur before the outcome, and it is essential for a causal interpretation.
Correct answer: The exposure occurred before illness- 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.
Correct answer: Mean is greater than median