Over the Last Several Thousand Years,leeches Have Been Utilized by Humans

question 38

Multiple Choice

Over the last several thousand years,leeches have been utilized by humans

• A)to attack foreign invaders.
• B)to remove blood from the body.
• C)to prevent malaria.
• D)as food.
• E)to investigate the functioning of nervous systems.

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Definitions:

Independent Variables

Variables in an experiment that are manipulated to determine if they cause a change in the dependent variable.

Observations

The individual entities or datapoints collected for research or analysis purposes, providing the basis for statistical conclusions.

Degrees Of Freedom

The number of independent values or quantities which can be assigned to a statistical distribution or to a system, without violating any constraints.

Critical Value

A point on the scale of the test statistic beyond which we reject the null hypothesis, used in hypothesis testing.