Sound Can Best Be Thought of as

question 3

Multiple Choice

Sound can best be thought of as

• A) compression of air molecules by an object.
• B) changes in air pressure produced by the vibration of an object.
• C) particles of energy that travel at better than 20 miles per hour.
• D) packets of energy.
• E) expansion of air molecules produced by an object as it moves through air.

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Definitions:

Kruskal-Wallis Test

A non-parametric method used for comparing more than two samples that are independent, or not related.

Null Hypothesis

A statement that there is no difference or effect, typically to be tested against an alternative hypothesis proposing a difference or effect.

Significance Level

The probability of rejecting the null hypothesis when it is actually true; a threshold chosen by the researcher to indicate the level of evidence needed to reject the null hypothesis.

Kruskal-Wallis Test

A nonparametric statistical test used to compare three or more independent samples to determine if they originate from the same distribution.