To determine if there is a relationship between grade performance and extracurricular participation, North Carolina State conducted a study of 112 students, recording the number of students in each of three extracurricular categories, and each of two grade categories. Here are the results: Good grades Poor grades Low extra-curricular participation 11 2 Moderate extra-curricular participation 68 23 High extra-curricular participation 3 5 Source: Felder, et al., "A Study of Student Performance in an Introductory Chemical Engineering Course," 1992 ASEE Annual Conference Proceedings, pp. 1516-1519. Which one of the following facts should make you the most worried about the reliability of the results of the test in this case? Two of the six expected counts are less than 5. The 112 students were all students in a chemical engineering course and not a random sample from the entire student body. Not all of the cells' contributions to the chi-squared statistic are greater than 1. O Two of the observed counts are less than 5