AT&T Would Like to Test the Hypothesis That the Proportion

question 21

Multiple Choice

AT&T would like to test the hypothesis that the proportion of 18- to 34- year- old Americans that own a cell phone is less than the proportion of 35- to 49- year- old Americans. A random sample of 200 18- to 34- year- old Americans found that 126 owned a smartphone. A random sample of 175 35- to 49- year- old Americans found that 119 owned a smartphone. If Population 1 is defined as 18- to 34- year- old Americans and Population 2 is defined as 35- to 49- year- old Americans, which one of the following statements is true?

• A)Because the 98% confidence interval includes zero, AT&T can conclude that the proportion of 18- to 34- year- old Americans that own a cell phone is less than the proportion of 35- to
• B)Because the 98% confidence interval does not include zero, AT&T cannot conclude that the proportion of 18- to 34- year- old Americans that own a cell phone is less than the proportion of 35- to 49- year- old Americans.
• C)Because the 98% confidence interval includes zero, AT&T cannot conclude that the proportion of 18- to 34- year- old Americans that own a cell phone is less than the proportion of 35- to 49- year- old Americans.
• D)Because the 98% confidence interval does not include zero, AT&T can conclude that the proportion of 18- to 34- year- old Americans that own a cell phone is less than the proportion of 35- to 49- year- old Americans.

---

Definitions:

Outstanding Shares

The total number of shares of stock that are currently owned by all shareholders, including share blocks held by institutional investors and restricted shares owned by the company’s insiders.

Copper Production

The process of extracting copper from its ores and converting it into pure metal for use in various industries, including electrical wiring, construction, and automotive.

Nickel Production

The process of extracting nickel ores from the ground and refining them into pure nickel, used in various industrial applications.

Deferred Tax

A tax liability or asset that arises due to the temporary differences between the accounting income and the taxable income.