Suppose That the Amount of Time Teenagers Spend on the Internet

question 84

Short Answer

Suppose that the amount of time teenagers spend on the Internet is normally distributed, with a standard deviation of 1.5 hours. A sample of 100 teenagers is selected at random, and the sample mean is computed as 6.5 hours.
Determine the 95% confidence interval estimate of the population mean, changing the population standard deviation to 1.2.

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Definitions:

Enable

To activate or allow a system or device to operate, often controlled by an electronic or mechanical switch.

Three-Wire

A wiring system that consists of a phase wire, a neutral wire, and a protective ground wire, commonly used in residential and commercial settings.

Energized

To be energized means to supply or be supplied with electric power, causing a device, circuit, or component to become active or operative.

Normally Closed

A term used to describe a state of a switch or relay when its contacts are closed, allowing current to flow, in the absence of an actuating signal.