Patrice Randomly Assigns Thirty Couples to a Problem-Solving Skills Training

Patrice randomly assigns thirty couples to a problem-solving skills training group and another thirty couples to a group where they have group discussions about their relationship problems, but no specific training is provided. She assesses positive and negative problem-solving behavior before and after the groups, and she finds that after the groups, couples in the skills training group have higher positive and lower negative behavior scores than couples in the discussion group. What can Patrice conclude from this?

A) Patrice can conclude nothing; she has to conduct statistical analyses to determine whether there is a significant difference between her groups.
B) Patrice can conclude that her skills training program improves behavior because she conducted a controlled experiment.
C) Patrice can conclude nothing until she conducts a meta-analysis of her results.
D) Patrice can conclude that the skills training program improves behavior, and that this finding is not due to chance.