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

question 22

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.Based on the sample results,what is the 90% confidence interval estimate for the true population proportion of suspension helmets that would fail the test?

• A)(0.304,0.416)
• B)(0.256,0.464)
• C)(0.213,0.507)
• D)(0.272,0.448)
• E)(0.553,0.737)

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Definitions:

Population Mean

The average of a set of characteristics, measurements, or counts in the entire population being studied.

SRS

Simple Random Sampling, a fundamental sampling technique where each member of the population has an equal chance of being selected.

Margin Error

The highest degree to which the outcomes from a sample are anticipated to vary from the actual value of the population.

Sample Size

Refers to the number of observations or data points that are collected and used for statistical analysis.