Suppose a Simple Regression Model Is Calculated Assessing the Association

question 5

Multiple Choice

Suppose a simple regression model is calculated assessing the association between exercise (hours per week) and pulse per minute. Pulse is the dependent variable. The estimated slope is -0.5, r = -0.5 and r² = 0.25. Which of the following is true?

• A) There is a perfect negative association.
• B) 25% of the variation in pulse is explained by exercise.
• C) As exercise increases by 1 hour, pulse increases by 0.5, on average.
• D) There is a positive association between exercise and pulse.

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Definitions:

Tower Commission

An investigative body appointed by U.S. President Ronald Reagan in 1986 to probe the Iran-Contra Affair, which involved illegal sales of arms to Iran and diversion of profits to Nicaraguan rebels.

Oliver North's Weapons Deals

Part of the Iran-Contra affair, where U.S. Marine Lt. Col. Oliver North was involved in the sale of arms to Iran with the intention of funding Contra rebels in Nicaragua during the 1980s.

Ronald Reagan

The 40th President of the United States, who served from 1981 to 1989, known for his conservative policies and strong stance against the Soviet Union.

Mikhail Gorbachev

The last leader of the Soviet Union, serving from 1985 until its dissolution in 1991, known for his policies of glasnost (openness) and perestroika (restructuring).