DrPeters Conducted a Study to Examine the Effects of Family

Multiple Choice

Dr.Peters conducted a study to examine the effects of family income on the types of attachments that infants form with their primary caregivers.Because the participants were not randomly assigned to groups,Dr.Peters

A) cannot conduct any informative statistical analyses.
B) must redo the study with randomly assigned groups.
C) cannot conduct a quasi-experiment.
D) must be cautious when interpreting the results of his study.