Nokea
The mean BP of a group of persons was determined and after an intervention trial the mean BP was estimated again the test to be applied to determine the significance of intervention is:
- A. Chi square test
- B. Paired test
- C. Correlation coefficient
- D. Z test
Correct Answer: B
Rationale: Paired tests evaluate changes within the same group before and after an intervention.
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validity stands for.
- A. accuracy
- B. reliability
- C. consistency
- D. all
Correct Answer: A
Rationale: Validity refers to how accurately a method measures what it is intended to measure.
A constant rate of change would be represented by a curved line
- A. Arithmetic-scale line graph
- B. Semilogarithmic-scale line graph
- C. Both
- D. Neither
Correct Answer: A
Rationale: On arithmetic-scale graphs, constant rates appear as straight lines.
The vector responsible for leishmaniasis is:
- A. mosquito
- B. bugs
- C. tsetse flies
- D. sandflies
Correct Answer: D
Rationale: Sandflies are the vectors responsible for transmitting leishmaniasis.
Once a case definition for an outbreak investigation has been established, it should not be changed.
- A. TRUE
- B. FALSE
Correct Answer: B
Rationale: Case definitions may need adjustment as new information becomes available during an investigation.
The best measure of association to use for these data is a/an:
- A. Food-specific attack rate
- B. Odds ratio
- C. Rate ratio
- D. Risk ratio
Correct Answer: B
Rationale: Odds ratios are appropriate for case-control studies.