A company institutes an exercise break for its workers to see if it will improve job satisfaction as measured by a questionnaire that assesses workers' satisfaction. Scores of 12 randomly selected workers before and after implementation of the exercise program are shown below. Do these results show that the exercise break is effective? Test an appropriate hypothesis at a significance level of 0.05 and state your conclusion. Provide an assessment of the validity of your results and a rationale for the method chosen.

before: 36, 28, 35, 28, 26, 27, 29,45, 24, 15, 15, 27

after: 29, 37, 33, 36, 37, 41, 50, 41, 39, 21, 20, 37

PLEASE WITH ENOUGH DETAIL, I NEED TO LEARN. I ALSO DO NOT HAVE ENOUGH TIME, ONLY 40 MINS