Nokea
On which day and at which meal was exposure most likely in the norovirus outbreak among tourists?
- A. April 19 Dinner
- B. April 20 Breakfast
- C. April 20 Lunch
- D. April 20 Dinner
Correct Answer: D
Rationale: Given the incubation period, dinner on April 20 aligns with symptom onset timing.
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Horizontal line drawn from 50% tick mark to plotted curve intersects at median
- A. Cumulative frequency curve
- B. Survival curve
- C. Both
- D. Neither
Correct Answer: A
Rationale: This feature describes cumulative frequency curves where the median is identified.
Define the following terms: synergism
- A. The combined effect of two factors is greater than the sum of their individual effects.
- B. The combined effect of two factors is less than the sum of their individual effects.
- C. The neutralization of one factor by another.
- D. The isolation of one factor from another.
Correct Answer: A
Rationale: Synergism occurs when two or more factors interact to produce an effect that is greater than the sum of their individual effects.
What is the incidence of disease during July?
- A. 3 / 700
- B. 4 / 700
- C. 5 / 700
- D. 8 / 700
Correct Answer: A
Rationale: Incidence counts only new cases during a time period.
The measure of central location most commonly used with the interquartile range is the:
- A. Arithmetic mean
- B. Geometric mean
- C. Median
- D. Midrange
Correct Answer: C
Rationale: The median is typically paired with the IQR to summarize data.
Define in your own words the term 'the natural history of disease'.
- A. The progression of a disease without medical intervention.
- B. The impact of treatment on disease outcomes.
- C. The study of disease origins.
- D. The distribution of diseases in populations.
Correct Answer: A
Rationale: The natural history of disease refers to the course a disease takes in the absence of medical intervention, from onset to resolution.