A study that compared novice drivers and experienced drivers with respect to the relative number of driving errors they made while using a cell phone or not using a cell phone resulted in the same amount of deterioration in both groups.
This type of design
a. is appropriate for analysis with a t test.
b. involved two manipulated variables.
c. used a nonequivalent groups design.
d. used a reduced factorial design.
Question 2
The state of Vermont tried to anticipate the degree to which middle- and high-school students contemplated suicide. The state collected data from students in 1993, 1995, and 1997 . This approach reflects
a. a cohort study.
b. a trend study.
c. a cross-sectional study.
d. a retrospective study.
Species-rich floras of chalk grassland compared to species-poor floras of acid soils.
The frequency of competition according to the number of species involved.
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