One Difference Between a Confounding Variable and a Proxy Variable

question 79

Multiple Choice

One difference between a confounding variable and a proxy variable is that:

• A)confirming causal relationships is made more difficult by confounding variables and easier by proxy variables
• B)confirming causal relationships is made more difficult by proxy variables and easier by confounding variables
• C)confounding variables cannot be studied at all, while proxy variables can
• D)proxy variables cannot be studied at all, while confounding variables can
• E)confounding variables occur in nature, whereas proxy variables are always put in place by humans

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Definitions:

Optimal Force

The best or most efficient level of force that muscles can produce to perform an activity or task effectively without injury.

Prolonged Period

An extended duration of time that goes beyond what is normal or expected.

Muscle Endurance

The ability of a muscle or group of muscles to perform repetitive contractions over a period of time without becoming fatigued.

Undue Fatigue

Excessive tiredness not proportionate to the activity level, often a sign of underlying health issues or overexertion.