Nokea
The geometric mean is the value that:
- A. Is midway between the lowest and highest value on a log scale
- B. Occurs most often on a log scale
- C. Has half the observations below it and half above it on a log scale
- D. Is statistically closest to all of the values in the distribution on a log scale
Correct Answer: A
Rationale: Geometric mean finds the central tendency for a set of numbers by using the product of their values.
You may also like to solve these questions
30 babies were born in hospital, 10 were less than 2.5 kg and 20 were greater than 2.5 kg the average is
- A. Arithmetic mean
- B. Median
- C. Geometric mean
- D. Mode
Correct Answer: B
Rationale: The median divides the data into two equal parts, making it suitable here.
Which of the following is the best indicator of health status of a community?
- A. Birth rate
- B. Infant mortality rate
- C. Crude death rate
- D. None of the above
Correct Answer: B
Rationale: Infant Mortality Rate (IMR) is widely regarded as a sensitive indicator of the health status of a community, reflecting access to healthcare, nutrition, and living conditions.
obesity occurs due to:
- A. more consumption of calorie
- B. more consumption of protein
- C. more consumption of vitamins
- D. None
Correct Answer: A
Rationale: Obesity results from excessive calorie intake compared to energy expenditure.
How would the clinical and epidemiologic descriptions of a disease differ, and how would they be similar?
- A. Clinical focuses on individual cases; epidemiologic focuses on populations.
- B. Clinical uses laboratory tests; epidemiologic uses surveys.
- C. Clinical focuses on treatment; epidemiologic focuses on prevention.
- D. Both focus on identifying disease causes.
Correct Answer: A
Rationale: Clinical descriptions emphasize individual diagnosis and treatment, while epidemiologic descriptions analyze patterns and causes in populations.
A local health department epidemiologist investigated an outbreak of gastrointestinal illness thought to be associated with a college cafeteria. There were many complaints about the quality of the cafeteria's offerings, and it appeared that the students' worst expectations were confirmed when several students visited the college's infirmary during the middle of the night and the following day complaining of nausea, diarrhea, fever, vomiting, and cramps. The health department's investigation revealed that 24 students had eaten in the cafeteria immediately before the outbreak. The times between eating in the cafeteria and the development of active symptoms ranged from 20 to 36 hours. A list of foods eaten, the number of persons eating the foods, and tabulations of illness are presented in Appendix 12. Fill in the attack rates where indicated. On the basis of your calculations, answer the following questions: What food or foods would you suspect caused the problem?
- A. Chicken salad
- B. Potato salad
- C. Both A and B
- D. Neither A nor B
Correct Answer: C
Rationale: High attack rates for both chicken and potato salads suggest they were contaminated.