In Testing the Difference Between the Means of Two Normally

question 64

Multiple Choice

In testing the difference between the means of two normally distributed populations,the number of degrees of freedom associated with the unequal-variances t-test statistic usually results in a non-integer number.It is recommended that you:

• A) round to the nearest integer.
• B) change the sample sizes until the number of degrees of freedom becomes an integer.
• C) assume that the population variances are equal,and then use df = n₁ + n₂ - 2.
• D) None of these choices.

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Definitions:

Bedridden

A state in which a person is unable to rise from bed due to illness or disability.

Eccentric Tension

A type of muscle contraction where the muscle elongates while under tension, often engaged during the lowering phase of a lift.

Isotonic Contraction

A type of muscle contraction in which the muscle changes length while the tension remains constant, typically involved in lifting and moving objects.

Isometric Contraction

Muscle contraction that occurs without changes in muscle length, resulting in tension without movement.