Last School Year, the Student Body of a Local University

question 28

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 400 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. At a .01 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:

Shaping

A method of behavior training in which reinforcement is given for progressively closer approximations of the desired behavior.

Ratio Schedule

In behavior modification, a reinforcement schedule that provides rewards after a certain number of responses, encouraging consistent behavior.

Interval Schedule

A type of reinforcement schedule in operant conditioning that delivers a reward after a variable or fixed interval of time has passed.

Operant Response Rates

The rate at which an organism performs a behavior that is reinforced by a consequence in a given period, used in operant conditioning research.