The Following Information Regarding a Dependent Variable Y and an Independent

question 109

Multiple Choice

The following information regarding a dependent variable y and an independent variable x is provided: $$\begin{array} { l l } \Sigma x = 90 & \sum \left( y - \frac { y } { ) } \right) ( x - x ) = - 156 \\\Sigma y = 340 & \Sigma \left( x - \frac { x } { 2 } \right) ^ { 2 } = 234 \\n = 4 & \sum ( y - y ) ^ { 2 } = 1974 \\\mathrm { SSR } = 104 &\end{array}$$ The coefficient of correlation is

• A) -.2295.
• B) .2295.
• C) .0572.
• D) -.0572.

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Definitions:

Decomposers

Organisms such as fungi and bacteria that break down dead organic material, returning nutrients to the ecosystem.

Biomass Pyramid

A graphical representation showing the relative amount of living organic matter available at each trophic level in an ecosystem.

Anaerobic Respiration

A process by which organisms produce energy without the use of oxygen.

Pyramid of Biomass

A graphical representation showing the total mass of living organisms at each trophic level in an ecosystem.