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.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.

one way archaeology us understand the past is through the material objects it finds, allowing us to know what was being used, and when. for example a dig recently found a flute, believed to be the oldest musical instrument found to date.

i hope this