US Smartphone Owners Aged 18 to 24 Send an Average

question 70

Multiple Choice

US smartphone owners aged 18 to 24 send an average of 2,022 text messages per month (Source: Businessinsider.com, 2013) .Suppose that the random variable "monthly text messages sent" is normally distributed.If exactly 20 percent of smartphone owners aged 18 to 24 send 3000 or more texts per month, what is the standard deviation of the random variable "monthly test messages sent"?

• A)404
• B)978
• C)1,164
• D)1,881
• E)2,196

Identify the physical and chemical properties related to the structure of organic compounds.

Understand the steps and components in constructing a confidence interval for population variance.

Comprehend the role and distribution of the test statistic in hypothesis testing about the population variance.

Ability to perform hypothesis testing about the population variance under given conditions.

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Definitions:

Physical Capital

Tangible assets that are used in the production process, such as machinery, buildings, and equipment.

Technology

The application of scientific knowledge for practical purposes, especially in industry, where it affects methods of production, communication, and transportation.

Natural Resources

Materials or substances that occur in nature which can be utilized for economic gain, such as minerals, forests, water, and fertile land.

International Trade

The exchange of goods, services, and capital across international borders or territories, driven by comparative advantage.