Many Surveys Are Conducted Over the Phone

question 35

Multiple Choice

Many surveys are conducted over the phone.Which of the following would be most likely to cast doubt on the external validity of these studies?

• A)The person conducting the survey was not good at operating a telephone.
• B)Some of the calls were dropped and the person had to be called back.
• C)The phone surveys were conducted by 12 surveyors instead of one.
• D)All of the people participating in the survey own telephones.
• E)The phone calls were not all placed at the same time of day.

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Definitions:

Chitin-Hardened Jaws

Structural feature referring to jaws strengthened by chitin, a fibrous substance forming the exoskeleton of arthropods and other organisms.

Marine Polychaetes

A diverse class of annelid worms, commonly known as bristle worms, that live in various marine environments.

Chitin-Reinforced Bristles

Stiff bristles made stronger with the natural polymer chitin, commonly found in the exoskeletons of arthropods.

Chitin-Hardened Tentacles

Tentacles strengthened by chitin, a polysaccharide found in the exoskeletons of arthropods and cell walls of fungi.