A major company would like to assess the impact of using a professional trainer to conduct a confidence-building workshop with its salespeople. A sample of 20 workers is obtained. Half (n = 10) attend the workshop and the other half (n = 10) serve as a control group. Two weeks later, each of the participants is given a questionnaire measuring their level of self-confidence. The data are as follows: Control Workshop M = 20 M=26 SS = 120 SS=240 Does the workshop have a significant effect? Use an alpha level of .05, two tails. Carry out all four steps of a hypothesis test. Round to 3 decimal places as needed. You can type out your work here or upload your work. a. State the hypotheses (Ho and H) (4 points): b. State the degrees of freedom and locate the critical region using the t distribution table (2 points): c. Compute the pooled variance and the test statistic (8 points): d. Make a decision about the null hypothesis, and state a conclusion (2 points): e. Compute Cohen's d to measure the size of the treatment effect (4 points. 2 points for work, 2 points for correct d value.) Cohen's d=