Which type of study should be used when data are collected at only one point in time?
a. Cross-sectional
b. Retrospective
c. Longitudinal
d. Prospective
ANS: A
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A Cross-sectional design is associated with data collection at one point in time.
B Retrospective design is analysis of data that has already been collected.
C Longitudinal design involves data collection over a specific period.
D Prospective design involves data collection over time into the future.
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