Twin and Adoption Studies Indicate

question 128

Multiple Choice

Twin and adoption studies indicate:

• A)Since alcoholism tends to follow family lines,it must be inherited.
• B)The heritability for alcoholism is around 50-60 percent.
• C)Alcoholism is determined more by environment than genetics.
• D)The heritability for alcoholism is around 20-30 percent.

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Definitions:

Independent Variable

A variable that is manipulated to determine its effect on a dependent variable.

Critical T Value

The threshold value in t-testing that determines whether to reject the null hypothesis, based on the desired level of significance.

Significance

The likelihood that a relationship between two or more variables is caused by something other than random chance.

Slope

The slope is the measure of the steepness or incline of a line, defined as the ratio of the vertical change to the horizontal change between two points on the line.