In an Area of the Midwest, Records Were Kept on the Relationship

question 27

Multiple Choice

In an area of the Midwest, records were kept on the relationship between the rainfall (in inches) and the yield of wheat (bushels per acre) . Calculate the correlation coefficient, r. $$\begin{array} { l | c | c | c | c | c | c | c | c | c | } \text { Rain fall (in inches) , } x & 9.5 & 7.8 & 12.4 & 11.5 & 17.8 & 9.3 & 6 & 14.6 & 15 \\\hline \text { Yield (bushels per acre) , y } & 45.5 & 41.2 & 53.8 & 54 & 77.4 & 44.2 & 26.9 & 71 & 73.8\end{array}$$

• A)0.981
• B)0.998
• C)0.900
• D)0.899

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Definitions:

Grassland Biome

A biome characterized by vast open spaces of grasses, few trees or shrubs, and supports a variety of animals adapted to these conditions.

Trophic Level

Refers to the hierarchical levels in an ecosystem, determining an organism's position in the food chain, from primary producers to apex predators.

Big Bluestem Grass

A tall North American prairie grass that is a dominant species in the Great Plains, known for its nutrient-rich forage.

Abiotic Components

Non-living chemical and physical parts of the environment that affect living organisms.