Does the color of an instructional sign make a difference in a person's obedience to the sign? A student researcher investigated the question using double doors at the entrance of a college's library. The researcher put a sign on the door on the right facing the exit. The sign read, USE OTHER DOOR with an arrow pointing to the door on the left. The researcher recorded which door students used as they exited the library to see what proportion used the door on the left when the sign was printed on red paper, printed on yellow paper, and (as a control) no sign at all. The results are summarized in the table. Red paper Yellow paper No sign Total Left door 25 14 13 52 Right door 28 40 42 110 Total 53 54 55 162 Determine the proportion of students who used the left door for each color of paper.Red paper: Yellow paper: No sign: . Ex: 1.234 The Mean Group Diff statistic is Ex: 1.234