An Engineer Wants to Know If the Average Amount of Energy

question 20

Essay

An engineer wants to know if the average amount of energy used in his factory per day has changed since 2005.The factory used an average of 2,000 megawatt hours (mwh)per day prior to 2005.Since 2005,the engineer surveyed 400 days and found the average energy use was 2,040 mwh per day.Assume that the population standard deviation is 425 mwh per day.
a.Specify the null and alternative hypotheses to determine whether the factory's energy use has changed.
b.Calculate the value of the test statistic and the p-value.
c.At the 5% significance level,can you conclude that the energy usage has changed? Explain.

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Definitions:

Discrimination Law

The body of law that prohibits unfair treatment of individuals based on certain protected characteristics such as race, gender, age, and disability.

Apparent Agency

A legal concept where a principal is liable for the acts of an agent who appears to be acting within the scope of authority, irrespective of whether the principal actually granted such authority.

Express Agency

An agency relationship created by explicit instruction or agreement, where the agent is authorized to act on behalf of the principal.

Implied Agency

A type of agency relationship created by the actions of the parties involved, not by written agreement, where an agent is presumed to have authority to act on behalf of another.