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HESI LPN · HESI LPN Community Health Nursing · HESI Epidemiology Questions

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Showing all 5 practice questions with expert explanatory rationales.

Question 1 of 5

The measure of central location most commonly used with the standard deviation is the:

A. Arithmetic mean

B. Median

C. Midrange

D. Mode

Correct Answer: Arithmetic mean

Question 2 of 5

What is the following fraction? Number of children < 365 days of age who died in Country A in 2004 / Number of live births in Country A in 2004

A. Ratio

B. Proportion

C. Incidence proportion

D. Mortality rate

Correct Answer: Mortality rate

Question 3 of 5

What is the etiologic fraction of disease due to smoking among individuals with lung cancer?

A. 0.8

B. 0.9

C. 0.95

D. 0.99

Correct Answer: 0.9

Question 4 of 5

Define the following terms: threshold

A. The minimum dose of a substance required to produce an effect.

B. The maximum dose of a substance that can be tolerated.

C. The average dose of a substance that produces an effect.

D. The baseline level of a substance in the environment.

Correct Answer: The minimum dose of a substance required to produce an effect.

Question 5 of 5

A study in which children are randomly assigned to receive either a new vaccine or the current vaccine is an example of which type of study?

A. Experimental

B. Observational

C. Cohort

D. Case-control

Correct Answer: Experimental

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