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.
The greenhouse effect: heat trapping by earth's atmosphere.
T-Cell Maturation
The Flynn Effect
De novo and maintenance methylation of DNA and the effect of 5’-azacytidine upon DNA methylation
Effect of an Exogenous Shift in Income
The Effect of Multiple Contributing Genes on Phenotypic Variation