An industrial/organizational psychologist used a new training program designed to improve basic work skills. The training program is typically judged as effective if average scores on a basic work skills test exceed 80. The industrial/organizational psychologist obtained a random sample of participants who recently completed the training program, then administered to them a work skills test, their scores on the test are given in Data 12A.
(a) State the null and alternate hypothesis best suited to the nature of the psychologist’s inquiry.
(b) Test the null hypothesis at the .01 level of significance and state your conclusions.