Which research strategy attempts to address questions about cause-and-effect relationships but fails to produce an unambiguous answer because the study contains a flaw?

The synaptic pruning that was so prevalent in toddlerhood ________________

a. stops in early childhood b. continues in early childhood c. occurs only in the frontal lobes after toddlerhood d. occurs only in motor areas of the brain after toddlerhood

A factorial design in which participants are randomly assigned to groups is called a ________ design

a) between-subjects factoria b) within-subjects factorial c) mixed assignment d) matched sets