Guided Example #5 - Chi-Square Test

Employers particularly want to know which days of the week employees are absent in a five day work week. Most employers would like to believe that employees are absent equally during the week. That is, the average number of times an employee is absent is the same on Monday, Tuesday, Wednesday, Thursday, or Friday. Suppose a sample of 20 absent days was taken and the days absent were distributed as follows:

	Monday	Tuesday	Wednesday	Thursday	Friday
Number of Absences	5	4	2	3	6

What are the degrees of freedom (df )?

A. ${\displaystyle 6}$     B. ${\displaystyle 7}$     C. ${\displaystyle 4}$     D. ${\displaystyle 5}$