Nokea
What is the RR of dying of lung cancer for smokers versus nonsmokers?
- A. 7
- B. 10.14
- C. 15
- D. 20
Correct Answer: B
Rationale: RR = (Death rate among smokers / Death rate among nonsmokers) = 71 / 7 = 10.14. This indicates that smokers are approximately 10 times more likely to die of lung cancer than nonsmokers.
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In supervision the most appropriate word is
- A. Enforcement
- B. Reinforcement
- C. Suggestion
- D. Inspection
Correct Answer: C
Rationale: Supervision involves providing constructive suggestions and guidance.
The interquartile range covers what proportion of a distribution?
- A. 25%
- B. 50%
- C. 75%
- D. 100%
Correct Answer: B
Rationale: The IQR spans the middle 50% of the data.
Nature of common sources epidemic
- A. explosive
- B. slow
- C. static
- D. all
Correct Answer: A
Rationale: Common-source epidemics tend to have explosive patterns with sharp increases in cases.
Vibrio cholera are destroyed by all except
- A. boiling
- B. drying
- C. bleaching powder(1 mg/lit.)
- D. cresol
Correct Answer: D
Rationale: Cresol is not effective against Vibrio cholerae, while boiling, drying, and bleaching powder are effective methods for destroying the bacteria.
For 95% confidence limit truth is
- A. Reduces 95% confidence of values
- B. 96 of standard error of mean
- C. 56 of standard error of mean
- D. 5% of standard error of mean
Correct Answer: B
Rationale: For 95% confidence limits, approximately 1.96 times the standard error is used.