Given the area under a normal curve, which two of

Question 1 of 5

Given the area under a normal curve, which two of the following ranges are the same? (Circle the TWO that are the same.)

A. From the 2.5th percentile to the 97.5th percentile B. From the 5th percentile to the 95th percentile C. From the 25th percentile to the 75th percentile D. From 1 standard deviation below the mean to 1 standard deviation above the mean

Correct Answer: C

Rationale: A (2.5th to 97.5th) and E (±1.96 SD) both cover 95%, but the question’s format suggests C as an error; corrected to A and E in intent.

Question 2 of 5

When creating a bar chart, the decision to use vertical or horizontal bars is usually based on:

A. The magnitude of the data being graphed and hence the scale of the axis B. Whether the data being graphed represent numbers or percentages C. Whether the creator is an epidemiologist (who almost always use vertical bars) D. Which looks better, such as whether the label fits below the bar

Correct Answer: D

Rationale: Bar orientation is a design choice, often driven by label readability.

Question 3 of 5

Evaluating and improving surveillance should address which of the following? (Choose one wrong answer)

A. Purpose and objectives of surveillance B. Resources needed to conduct surveillance C. Effectiveness of measures for controlling the disease under surveillance D. Presence of characteristics of well-conducted surveillance

Correct Answer: C

Rationale: Evaluation focuses on purpose (A), resources (B), and quality (D). Control effectiveness (C) is an outcome, not a surveillance focus.

Question 4 of 5

Why should an investigator who has no clinical background nonetheless talk to a patient or two as an early step in the outbreak investigation? (Choose one wrong answer)

A. To advise the patient about common risk factors and the usual course of the illness, after reviewing such information in appropriate reference material B. To develop hypotheses about the cause of the outbreak C. To learn more about the clinical manifestations of the disease D. To verify the clinical findings as part of verifying the diagnosis

Correct Answer: A

Rationale: Talking to patients helps generate hypotheses (B) and understand symptoms (C). Advising (A) requires clinical expertise.

Question 5 of 5

Epidemiology, as defined in this lesson, would include which of the following activities? (Choose one wrong answer)

A. Describing the demographic characteristics of persons with acute aflatoxin poisoning in District A B. Prescribing an antibiotic to treat a patient with community-acquired methicillin-resistant Staphylococcus aureus infection C. Comparing the family history, amount of exercise, and eating habits of those with and without newly diagnosed diabetes D. Recommending that a restaurant be closed after implicating it as the source of a hepatitis A outbreak

Correct Answer: B

Rationale: Epidemiology describes (A) and compares (C). Prescribing (B) is clinical, not epidemiological.

Given the area under a normal curve, which two of the following ranges are the same? (Circle the TWO that are the same.)

Nurselytic

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