When the Change in the Dependent Variable Could Be Due

question 15

Multiple Choice

When the change in the dependent variable could be due to extreme scores moving to the mean on subsequent testing, __________ is a threat to internal validity.

• A)history
• B)maturation
• C)regression to the mean
• D)selection

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Definitions:

Duodenum

The portion of the small intestine into which the contents of the stomach first enter.

Omnivore

An animal that eats a variety of plant and animal materials.

Earthworm

A tube-shaped, segmented worm found in the phylum Annelida that plays a key role in aerating and enriching soil.

Sheep

A domesticated ruminant mammal, typically kept as livestock for meat (lamb, mutton) and for wool.