Exhibit 12-2
Last school year, the student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classification. 
We are interested in determining whether or not there has been a significant change in the classifications between the last school year and this school year.
-Refer to Exhibit 12-2. The expected frequency of seniors is
Definitions:
Risk-Prone Health Behavior
Behaviors or practices that increase the likelihood of developing health problems or complications.
Sleep Deprivation
A condition resulting from insufficient sleep, which can lead to a variety of cognitive, emotional, and physical impairments.
Ineffective Protection
A state or condition wherein an individual is unable to guard against internal or external factors that can cause harm or injury.
Immunizations
The process of providing immunity to specific diseases through vaccination, an essential component of public health.
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