During a Test Period, an Experimental Group of 10 Vehicles

question 5

Multiple Choice

During a test period, an experimental group of 10 vehicles using an 85 percent ethanol-gasoline mixture showed mean CO₂ emissions of 667 pounds per 1000 miles, with a standard deviation of 20 pounds. A control group of 14 vehicles using regular gasoline showed mean CO₂ emissions of 679 pounds per 1000 miles with a standard deviation of 15 pounds. Assuming equal variances, the pooled variance is:

• A)296.59
• B)225.00
• C)400.00
• D)522.16

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Definitions:

Services

Economic activities that provide intangible products, such as healthcare, education, and financial services, to consumers.

Durable Goods

Items or products that are expected to last for several years under normal use, such as appliances and vehicles.

Nondurable Goods

Items with a short life span which are consumed or used up quickly, such as food and most consumer packaged goods.

Services

Intangible products such as healthcare, education, and financial advice that are consumed at the point of sale and do not result in ownership of any physical or digital goods.