I If an Inverse Relationship Exists Between the Dependent Variable

question 49

Multiple Choice

i. If an inverse relationship exists between the dependent variable and independent variables, the regression coefficients for the independent variables are positive.
Ii) Given a multiple linear equation Y' = 5.1 + 2.2X1 - 3.5X2, assuming other things are held constant, an increase of one unit in the second independent variable will cause a -3.5 unit change in Y.
Iii) When the variance of the differences between the actual and the predicted values of the dependent variable are approximately the same, the variables are said to exhibit homoscedasticity.

• A) (i), (ii) and (iii) are all correct statements
• B) (i) and (ii) are correct statements, but not (iii).
• C) (i) and (iii) are correct statements but not (ii).
• D) (ii) and (iii) are correct statements but not (i).
• E) All statements are false

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Definitions:

Oscilloscope

An electronic instrument that visually displays varying signal voltages, usually as a two-dimensional graph of one or more signals as a function of time.

Action Potential

A rapid and temporary electrical charge that travels along the membrane of a neuron, signaling neuronal activity.

Single-Cell Recording

A neurophysiological technique for measuring the electrical activity of individual neurons in a living organism.

Electrode

A conductor through which electricity enters or leaves an object, substance, or region.