Refer to the Graph

question 7

Multiple Choice

Refer to the graph. "Collapsed" fish taxa are species or groups of species that have declined to less than 10 percent of the biomass they had before they were fished.These low numbers represent commercial extinction, or levels too low to produce a profit when those taxa are fished.Changes in the numbers of collapsed taxa since 1950 are shown in the graph.The trend shown indicates that

• A) fish species are currently recovering from overharvesting.
• B) the number of collapsing taxa is still tending to increase.
• C) overharvesting is not a serious problem, since only 20 percent of taxa have collapsed.
• D) improved technology, introduced about 1980, has solved the overharvesting problem.
• E) top predator fish (such as tuna) are recovering, but smaller fish (such as herring) are not.

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Definitions:

Regression Toward

A statistical phenomenon where extreme values in data are likely to be followed by, or associated with, less extreme values.

Pretest

An initial measurement or evaluation performed before an intervention or experiment to establish a baseline.

Posttest

A test given after a particular intervention or period of instruction to measure its effectiveness or outcomes.

Construct Validity

The extent to which a test or instrument measures the theoretical construct it is intended to measure.