A Cell Phone Service Provider Has Selected a Random Sample

question 47

Multiple Choice

A cell phone service provider has selected a random sample of 20 of its customers in an effort to estimate the mean number of minutes used per day. The results of the sample included a sample mean of 34.5 minutes and a sample standard deviation equal to 11.5 minutes. Based on this information, and using a 95 percent confidence level:

• A) the critical value is z = 1.96
• B) the critical value is z = 1.645
• C) the critical value is t = 2.093
• D) The critical value can't be determined without knowing the margin of error.

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Definitions:

Throughput

Measures the rate at which a system processes tasks, data, or communications during a specific time frame.

Connection Speed

Refers to the rate at which data is transferred from the internet to a user's device or vice versa.

Broadband

The transmission capacity of a communications medium that is faster than 25 Mbps.

Downloadability

The capability of digital content to be transferred from the internet to a user's local computer or device.