UGC NET Questions (Paper – 1)

A trend study examines changes in a population characteristic over time by drawing new samples from the same population at each measurement occasion. The focus is on how aggregate distributions or averages shift, not on following the same individuals. This design is common in opinion polls and large-scale social surveys. Therefore, a longitudinal survey that uses different samples at successive times is correctly called a trend study.

Option A:
Panel studies repeatedly survey the same individuals over time, allowing analysis of individual-level change but not necessarily different samples of the population, so they do not match the stem.

Option B:
Cohort studies focus on a specific subpopulation that experienced a common event in the same period, such as a birth year group, and may follow either the same individuals or different samples from that cohort. They differ slightly from general population trend designs.

Option C:
Trend studies reveal shifts in attitudes or behaviours at the population level, such as changes in support for a policy across years, by comparing results from independently drawn samples. This feature aligns exactly with the stem, making this option correct.

Option D:
Cross-sectional studies collect data at only one point in time and therefore cannot track population change across multiple time points, so cross-sectional is not appropriate here.

Longitudinal studies involve repeated observations of the same individuals, groups or phenomena over an extended period. This design allows researchers to analyse changes, trends and developmental patterns that cannot be seen in single time-point studies. It is especially important in education, psychology and health research for understanding growth and long-term effects. Thus, a design collecting data from the same participants at multiple times is correctly termed a longitudinal study.

Option A:
Cross-sectional studies take a snapshot at one time point and cannot track individual changes over time. They may compare different groups but do not revisit the same participants, so cross-sectional does not match the stem.

Option B:
Option B, longitudinal, highlights that the time dimension is essential and that repeated measurements of the same units are central to the design. This fits the description of studying change over time, making this option correct.

Option C:
Experimental designs focus on manipulation and control; they may be conducted in cross-sectional or longitudinal formats, but experiment is not defined solely by repeated measurement of the same participants. Hence, experimental is not the best completion.

Option D:
Causal-comparative (ex post facto) designs compare existing groups after an outcome has occurred and do not necessarily involve repeated measurements across time. Therefore, they are not the correct answer here.