Three rival professors teaching English 1 all claim the honor of having the best students. To settle the issue, eight students are randomly drawn from each class and given the same exam. Copyright 2013 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s). Editorial review The exams are graded by a neutral professor who does not know from which class the students came. The data are shown.

Run the appropriate test and draw the appropriate conclusions.

Professor Professor Li Professor Bright Kessler 82 71 56 58 63 65 54 85 83 71 70 68 72 68 72 78 65 73 62 53