In Order to Estimate the Average Electric Usage Per Month

question 81

Multiple Choice

In order to estimate the average electric usage per month, a sample of 64houses was selected and the electric usage was determined. Assume a population standard deviation of 320 kilowatt-hours. At 95% confidence, the size of the margin of error is

• A) 1.96.
• B) 40.00.
• C) 78.40.
• D) 65.80.

---

Definitions:

Pure

Refers to a substance that is not mixed with any other substance, having a homogenous chemical composition.

Ionization

The process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons.

Important Factor

A significant element or aspect that contributes to a result or outcome.

Gas

A state of matter consisting of particles that have neither a defined volume nor defined shape, typically able to expand freely.