In time-series designs, comparison groups
A) are not possible to include.
B) are helpful.
C) always include random assignment.
D) cannot exceed two groups.
Question 2
By adding comparison groups in a study of the effects of child seat belt legislation in California, Guerin and MacKinnon (1985) were able to
A) perform more high-powered statistical procedures.
B) attenuate the reliability of their observations.
C) study the effects of other types of legislation on their target group.
D) increase confidence in their conclusions.
Comparison of the radius of fruits produced by native and introduced species of Sapindaceae
Comparison of energy consumption in developing and industrialized nations
Comparison of D-type Climates
Disitive Time For Milk Products
Three series of overlapping deletions in the A cistron of the rII locus
Surtsey, a volcanic island, during the time of its formation.