Last School Year, the Student Body of a Local University $$\begin{array} { l l } \text { Freshmen } & 83 \\\text { Sophomores } & 68 \\\text { Juniors } & 85 \\\text { Seniors } & 64\end{array}$$

question 42

Multiple Choice

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. $$\begin{array} { l l } \text { Freshmen } & 83 \\\text { Sophomores } & 68 \\\text { Juniors } & 85 \\\text { Seniors } & 64\end{array}$$ 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.At a .05 level of significance, the null hypothesis

• A) should not be rejected.
• B) should be rejected.
• C) was designed wrong.
• D) cannot be tested.

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Definitions:

Subject Reactivity

A phenomenon in which individuals alter their behavior or responses due to their awareness of being observed or studied.

Actuarial Prediction

A method used in various fields, including psychology and criminal justice, that utilizes statistical models to forecast future outcomes based on historical data.

ABAB Design

A type of experimental design consisting of four phases: a baseline phase (A), an intervention phase (B), a return to the baseline phase (A), and a second intervention phase (B), used to assess the effects of an intervention.