College Admissions Administrators at a University Are Reevaluating Their Entrance

question 39

Multiple Choice

College admissions administrators at a university are reevaluating their entrance requirements.They believe that the mean GPA for graduating high school seniors has increased dramatically over the last decade.They randomly sample 85 records of graduating seniors from 10 years ago (sample 1) and find an average GPA of 2.68.An independent random sample of 80 current graduating seniors yields an average GPA of 2.94.If the population variance of high school GPAs is 0.2601, does it appear that there was an increase in mean GPA over the last decade? Select the correct p-value and decision below.Use α = 0.01.Also, state H₀.

• A) p-value = 0.0005; fail to reject H₀; The null hypothesis is that GPA remained the same.
• B) p-value = 0.0010; fail to reject H₀; The null hypothesis is that GPA remained the same.
• C) p-value = 0.0005; reject H₀; The null hypothesis is that GPA remained the same.
• D) p-value = 0.0010; reject H₀; The null hypothesis is that GPA changed over time.

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Definitions:

Positive Reinforcers

Stimuli that, when introduced after a behavior, increase the likelihood of that behavior being repeated.

Counterconditioning

A behavior therapy technique that involves replacing an unwanted response to a stimulus with a wanted response.

Behavior Therapy

A type of psychotherapy that focuses on changing undesirable behaviors through conditioning, without delving into the underlying psychological causes.

Aversive Conditioning

A behavior conditioning technique in which unpleasant stimuli are associated with undesirable behaviors to discourage those behaviors.