32. (FACTUAL-21) A SEQUENTIAL RESEARCH DESIGN INCLUDES _______. A....

1-32. (factual-21) A sequential research design includes _______.

a. 2 or more longitudinal comparisons following different age groups

*b. 2 or more cross-sectional comparisons taken at different times

c. at least 2 separate representative samples

d. both multiple cross-sectional and longitudinal samples