Given below are two statements: Statement I: In Cohort studies, samples are…
2023
Given below are two statements:
Statement I: In Cohort studies, samples are drawn from a generally defined population over time.
Statement II: In Trend studies, samples are drawn from a specific well-defined population.
In the light of the above statements, choose the most appropriate answer from the options given below:
Answer: B. Both Statement I and Statement II are incorrect — CONCEPTTrend and cohort studies are longitudinal designs distinguished by the population observed over time. A trend study draws successive samples from the…
- A.
Both Statement I and Statement II are correct
- B.
Both Statement I and Statement II are incorrect
- C.
Statement I is correct but Statement II is incorrect
- D.
Statement I is incorrect but Statement II is correct
Show answer & explanation
Correct answer: B
CONCEPT
Trend and cohort studies are longitudinal designs distinguished by the population observed over time.
A trend study draws successive samples from the same broadly defined population, whereas a cohort study follows or repeatedly samples a specifically defined group whose members share a starting event or characteristic.
APPLICATION
Statement I assigns the broadly defined population to cohort studies, which reverses the standard distinction. Statement II assigns a specific well-defined population to trend studies, producing the same reversal. Therefore, both statements are incorrect.
CONTRAST
Accepting both claims preserves both reversals of the population scopes.
Accepting only the cohort claim still assigns a broadly defined population to a bounded cohort.
Accepting only the trend claim still assigns a specifically bounded group to the broader trend population.
CROSS-CHECK
Interchanging the design names in the two statements restores the standard definitions: trend studies use the broader population, and cohort studies use the specifically defined group. The result is: both Statement I and Statement II are incorrect.