A Researcher Wants to Assess the Effects of Varying Amounts

question 88

Multiple Choice

A researcher wants to assess the effects of varying amounts of alcohol on ratings of perception of friendliness.Three groups of people are given either one,two,or three beers to drink.Three more groups of people are given either one,two,or three nonalcoholic beers to drink.Then,all participants are shown a series of pictures of people's faces and are asked to rank the perceived friendliness of each face on a scale from 1 to 10.In this experiment,the independent variable is:

• A)the number of groups.
• B)the amount of alcohol consumed.
• C)the pictures of faces.
• D)ratings of perceived friendliness.

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Definitions:

Trypanosome

A genus of unicellular parasitic flagellate protozoa, some species of which cause diseases such as sleeping sickness in humans and animals.

Sleeping Sickness

A parasitic disease transmitted by the tsetse fly, characterized by fever, headaches, joint pains, and sleep disturbances.

Incomplete Digestive Tract

A type of digestive system where a single opening serves as both mouth and anus, common in simpler organisms like cnidarians and flatworms.

Trachea

In insects, air tube located between the spiracles and the tracheoles. In tetrapod vertebrates, air tube (windpipe) that runs between the larynx and the bronchi.