Question 21

Aerobic fitness, measured by the ability to consume oxygen, relates to the heart, blood vessels, and lungs working together to deliver oxygen-rich blood to the muscles during exercise. A high level of aerobic fitness is associated with lower risks of several diseases, including high blood pressure and coronary heart disease. In a study of aerobic fitness, a sample of 31 men involved in a physical fitness course at a university was randomly selected. The measurements included

Oxygen: the oxygen intake rate (ml per kg body weight per minute),

RunPulse: the heart rate while running.

Use the following R linear regression output to answer: What is the least squares regression line?

Call:lm(formula = Oxygen ~ RunPulse, data = oxy)

Coefficients: Estimate Std. Error t value Pr(>|t|)

(Intercept) 82.42903 15.044 5.481 0.001 ***

RunPulse -0.20691 0.089 -2.336 0.027 ***

Residual standard error: 4.971 on 29 degrees of freedomMultiple R-squared: 0.1582,

Adjusted R-squared: 0.1291 F-statistic: 5.423 on 1 and 29 DF, p-value = 0.027

Group of answer choices

Oxygen^=82.40.21RunPulse

Oxygen^=0.21+82.4RunPulse

RunPulse^=0.21+82.4Oxygen

Question 22

Aerobic fitness, measured by the ability to consume oxygen, relates to the heart, blood vessels, and lungs working together to deliver oxygen-rich blood to the muscles during exercise. A high level of aerobic fitness is associated with lower risks of several diseases, including high blood pressure and coronary heart disease. In a study of aerobic fitness, a sample of 31 men involved in a physical fitness course at a university was randomly selected. The measurements included

Oxygen: the oxygen intake rate (ml per kg body weight per minute),

RunPulse: the heart rate while running.

Use the following R linear regression output to answer: What percent of the variability in oxygen intake is explained by running heart rate?

Call:lm(formula = Oxygen ~ RunPulse, data = oxy)

Coefficients: Estimate Std. Error t value Pr(>|t|)

(Intercept) 82.42903 15.044 5.481 0.001 ***

RunPulse -0.20691 0.089 -2.336 0.027 ***

Residual standard error: 4.971 on 29 degrees of freedom

Multiple R-squared: 0.1582, Adjusted R-squared: 0.1291

F-statistic: 5.423 on 1 and 29 DF, p-value = 0.027

Group of answer choices

15.82%

12.91%

4.97%