A Regression Model Involving 4 Independent Variables and a Sample

question 70

Multiple Choice

A regression model involving 4 independent variables and a sample of 15 observations resulted in the following sum of squares. SSR = 165
SSE = 60
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If we want to test for the significance of the model at a .05 level of significance, the critical F value (from the table) is

• A) 3.06.
• B) 3.48.
• C) 3.34.
• D) 3.11.

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Definitions:

Phase Current

The current flowing through one phase circuit in a polyphase system, which could vary in magnitude and phase angle compared to currents in other phases.

Wye

A connection in three-phase systems where the ends of each phase are connected at a common point, forming a Y-like shape.

Delta

A method of connection for a three-phase electrical circuit that forms a triangle-like configuration.

Balanced Three-Phase System

A three-phase electrical system where all three phases carry equal currents and have the same voltage magnitude but are out of phase with each other by 120 degrees.