Below is a contingency table comparing smoking habits of students ages 18-25 with their parents: Parents Did Not Parents Smoke Total Smoke Child Smokes 25 84 109 Child Does Not 51 64 115 Smoke Total 76 148 224 What is the contribution to chi-squared from the cell where the parents smoke but the children do not? O 2.8 O 0.31 o 39 O 3.7