A researcher randomly assigns seven individuals to receive a new experimental procedure and seven to a control condition. At the end of the study, they are measured. Scores for those in the control group were 6, 1, 5, 3, 1, 4. Scores for those in the experimental group were 6, 4, 9, 7, 7, 3, 6. At alpha level = .05 (two-tailed), state the degrees of freedom , and critical value