At One SAT Test Site Students Taking the Test for a Second

question 47

Multiple Choice

At one SAT test site students taking the test for a second time volunteered to inhale supplemental
Oxygen for 10 minutes before the test. In fact, some received oxygen, but others (randomly
Assigned) were given just normal air. Test results showed that 42 of 66 students who breathed
Oxygen improved their SAT scores, compared to only 35 of 63 students who did not get the oxygen.
Which procedure should we use to see if there is evidence that breathing extra oxygen can help
Test-takers think more clearly?

• A) 2-proportion \(z\)-test
• B) 1 -proportion z-test
• C) 1 -sample \(t\)-test
• D) matched pairs \(t\)-test
• E) 2-sample \(t\)-test

---

Definitions:

First-Line Supervisors

Managers who are directly responsible for overseeing the work of entry-level or non-managerial employees.

Middle Managers

Employees occupying positions between entry-level and top management, responsible for implementing organizational policies and overseeing junior staff.

Union-Free Organizations

Organizations that operate without the presence or influence of labor unions, where the employer and employees interact directly without union representation.

Major Changes

Significant modifications or alterations made to processes, systems, policies, or environments that impact the way things operate or function.