A Study Was Conducted to Determine the Effectiveness of Interval

question 40

Multiple Choice

A study was conducted to determine the effectiveness of interval training (alternating between walking and running at a fast pace) on running speed. A sample of n = 9 runners improved their speed on 5K runs after the training by an average of M_D = 1.58 minutes with s_D = .61. What would the point estimate of the mean difference be in the population?

• A) 1.58
• B) .1756
• C) .1975
• D) 7.77

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Definitions:

Forced Expiration

The act of expelling air from the lungs with effort beyond normal exhalation, often used in pulmonary testing.

Residual Volume

Volume of air remaining in the lungs after a maximum expiratory effort.

Inspiratory Reserve Volume

The amount of air that can be forcibly inhaled after a normal inspiration, reflecting the capacity for additional air intake beyond the typical tidal volume.

Respiratory Membrane

A thin boundary comprising the alveolar and capillary walls where gas exchange between air and blood takes place in the lungs.