You Are Testing the Difference Between Two Population Means

question 4

Multiple Choice

You are testing the difference between two population means.The sample sizes are small.Under the assumption that the standard deviations of the two populations are equal and using a pooled estimator for the standard deviation, which of the following statements is true?

• A)the sample size must be increased in order to conduct a proper test
• B)the standard normal distribution can be used
• C)the t distribution with n₁ + n₂ degrees of freedom is used
• D)the t distribution with n₁ + n₂ - 2 degrees of freedom is used
• E)none of the above

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Definitions:

CPR

Cardiopulmonary Resuscitation, a life-saving technique that combines chest compressions and artificial ventilation to maintain circulatory flow and oxygenation during cardiac arrest.

Pulse

The rhythmic expansion and contraction of an artery produced by heartbeats, palpable at various body points and indicative of heart rate and circulation health.

Aspirating

The process of withdrawing fluid from a body cavity, cyst, or joint using suction, often performed using a syringe.

Oral Airway

A medical device used to keep the airway open by preventing the tongue from covering the epiglottis, thereby aiding in ventilation.