In Order to Estimate the Average Electric Usage Per Month

question 32

Multiple Choice

In order to estimate the average electric usage per month, a sample of 81 houses was selected and the electric usage was determined.Assume a population standard deviation of 450 kilowatt-hours.If the sample mean is 1858 kWh, the 95% confidence interval estimate of the population mean is

• A) 1760 to 1956 kWh.
• B) 1729 to 1987 kWh.
• C) 1758 to 1958 kWh.
• D) 1776 to 1940 kWh.

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Definitions:

Prone Position

A body position where one lies flat with the chest down and the back up, often used in medical treatment or exercises.

Pillow Placement

The strategic arrangement of pillows to support body parts for comfort, alignment, or therapeutic reasons, such as reducing strain or improving sleep quality.

Head Position

The orientation or angle of the head in relation to the body, which can affect breathing, swallowing, and posture.

Legs Position

The arrangement or posture of the legs, which can impact comfort, blood flow, or body alignment.