Scientists Are Always Thinking About Ways to Improve Experimental Design

question 19

Multiple Choice

Scientists are always thinking about ways to improve experimental design.In the text's potato chip experiment, which of these might do so?

• A) show a different movie
• B) exclude teenagers as group members
• C) collect uneaten chip remains and weigh them for both groups
• D) provide free drinks
• E) use a smaller theater

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Definitions:

Laryngitis

Inflammation of the voice box (larynx) usually resulting in hoarseness or loss of voice.

Pharyngitis

Inflammation of the pharynx, causing sore throat and difficulty swallowing; it can be caused by viruses or bacteria.

Thoracotomy

A surgical procedure involving an incision into the chest wall to access organs in the thoracic cavity.

Anthracosis

A lung condition caused by the inhalation of coal dust, leading to blackening of the lungs, also known as "black lung disease."