Guided Example #1 - Chi-Square Test

Absenteeism of college students from math classes is a major concern to math instructors because missing class appears to increase the drop rate. Three statistics instructors wondered whether the absentee rate was the same for every day of the school week. They took a sample of absent students from three of their statistics classes during one week of the term. The results of the survey appear in the table.

	Monday	Tuesday	Wednesday	Thursday	Friday
Number of students absent	28	22	18	20	32

How many students do you expect to be absent on any given school day?

A. ${\displaystyle 120}$     B. ${\displaystyle 5}$     C. ${\displaystyle 24}$     D. ${\displaystyle 12}$