In a Three-Pronged Plug, the Purpose of the Third Prong

question 52

Multiple Choice

In a three-pronged plug, the purpose of the third prong is to

• A) provide a short circuit to ground.
• B) prevent excessive power use by inefficient appliances.
• C) create a stronger connection to the outlet when plugged in.
• D) provide a path to ground in the event of a short circuit to the case of an appliance.

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Definitions:

Nondirectional Test

A hypothesis that does not predict the direction of the difference or association between variables, only that there is a difference.

One-Tailed Test

A statistical test that determines the probability of the observed data under the assumption that one end of the probability distribution is scrutinized.

Two-Tailed Test

A statistical hypothesis test in which the critical area of a distribution is two-sided and tests whether a sample is either greater than or less than a certain range of values.

Null Hypothesis

A statement suggesting that no statistical significance exists in a set of observations.