In a research design, the same group of participants is tested repeatedly. in a design, different age groups are tested at the same time. a. longitudinal; cross-sectional b. cross-sectional; longitudinal c. cross-sequential; cross-sectional d. longitudinal; cross-sequential

Correct answer is:

A. Longitudinal; Cross-sectional.

A longitudinal study is an observational analysis system in which data is collected for the identical subjects frequently across a span of time. Longitudinal analysis designs can elongate over years or indeed decades. In a longitudinal group research, the identical people are examined across the research period.

In the pharmaceutical analysis and political science, a cross-sectional research (also identified as a cross-sectional investigation, intersecting research, prevalence research) is a kind of observational research that examines data from a population, or a characteristic subset, at a particular duration in time—that is, cross-sectional data.

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they protect against unsafe foods and medicines being sold

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