In a crossover effect, maturation is an unlikely alternative hypothesis because
A) maturation cannot affect the control group.
B) maturation cannot affect the experimental group.
C) if maturation were responsible, it is unlikely that the effect would markedly differ for both groups.
D) it is likely that both groups mature at a different rate.
Question 2
Causality is inferred in a nonequivalent control-group design when
A) the control group remains essentially the same from pretreatment to post-treatment measures but the experimental group changes markedly in the predicted direction.
B) the experimental group remains essentially the same from pretreatment to post-treatment measures but the control group changes markedly in the predicted direction.
C) the control group and the experimental group remain essentially the same from pretreatment to post-treatment measures.
D) the control group and the experimental group change markedly in the predicted direction.
Effect of Knockout of the α5 Ach Receptor Gene in Mice
Effect of Stress on Immune Function
The Orographic Effect
Effect of Productivity Improvement in the Malthusian Model
The effect of selection on allele frequency
The consequences of crossover in the inversion loop in pericentric inversion heterozygotes