# random assignment

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## assignment

[ah-sīn´ment]the selection of something for a specific purpose.

**random assignment**in a research study, the assignment of subjects to experimental (treatment) or control groups in such a way that each member of a sample has an equal chance of being assigned to a particular group. Random assignment ensures that the groups will be as alike as possible at the beginning of the study. Called also randomization.

## random assignment,

*n*a method of allotting membership in research groups that tends to factor out any confounding variables so that any remaining differences can be attributed to the variable being researched.

## random

unplanned, without direction or purpose.

**random assignment**

see randomization.

**random mating**

where each member of the population has an equal opportunity of mating with every member of the opposite sex.

**random numbers**

a list of numbers obtained by a standard randomization procedure; used commonly to select individual animals from a pack.

**random sample**

see random sample.

**random sampling**

a procedure for selecting units from a group in such a way that each unit has an equal chance of being selected in the sample.

**random selection**

selection in such a way as to produce a random sample.

**random variable**

a group or quantity that takes various values, each with varying probabilities.

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