A Study Was Conducted at the University of Waterloo on the Impact

question 9

Multiple Choice

A study was conducted at the University of Waterloo on the impact characteristics of football helmets used in competitive high school programs.There were three types of helmets considered,classified according to liner type: suspension,padded-suspension,and padded.In the study,a measurement called the Gadd Severity Index (GSI) was obtained on each helmet,using a standardized impact test.A helmet was deemed to have failed if the GSI was greater than 1200.Of the 81 helmets tested,29 failed the GSI 1200 criterion.How many suspension-type helmets should be tested so that the margin of error does not exceed 0.05 with 95% confidence?

• A)385
• B)20
• C)271
• D)250
• E)82

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Definitions:

Washbasins

Shallow vessels or bowls used for washing oneself, typically part of a bathroom or kitchen setup.

Gram-negative Organisms

Bacteria characterized by their cell wall composition, which stains pink with the Gram staining method and can cause various infections.

Flossing

The act of using a thin thread to remove food and plaque from between teeth to maintain oral hygiene and prevent gum disease.

Plaque

A deposit of fatty and other substances that builds up in the inner lining of arteries, leading to atherosclerosis and potential blockage.