2. Point-slope form (-5,6) and(3,-10)
B. The study compares two or more treatments (possibly including "no treatment").
C. Data are gathered during the course of the study.
D. The study involves one or more treatment groups and a control group.
E. Replication with different groups of subjects can improve the reliability of the study.
Answer:
B and D
Step-by-step explanation:
Surveys are only tested with one group