In 2008,what Percentage of U

question 51

Multiple Choice

In 2008,what percentage of U.S.families had income levels above $113,205?

• A) 5 percent
• B) 20 percent
• C) 80 percent
• D) 95 percent

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Definitions:

Posttest-Only

A research design where measures are taken only after the experimental manipulation, without a pretest comparison.

Mortality

The loss of subjects who decide to leave an experiment. Mortality is a threat to internal validity when the mortality rate is related to the nature of the experimental manipulation.

Experimental Design

A research design used to test hypotheses and establish cause-effect relationships by manipulating one or more independent variables and observing the effect on dependent variables.

Mortality

The incidence of death within a population; in research, it can also refer to the dropout rate of participants from a study.