An Engineer Wants to Know If the Average Amount of Energy

question 59

Essay

An engineer wants to know if the average amount of energy used in his factory per day has changed since last year. The factory used an average of 2,000 megawatt hours (mwh) per day prior to last year. Since last year, 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.

• 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:

Just Cause

A legally supportable reason for taking an action, such as disciplining or terminating an employee, often defined in labor contracts or employment agreements.

Disciplinary Action

Measures taken by an employer or organization against its members or employees for violating rules or standards of conduct.

Employee Performance

An assessment of how effectively an employee completes their job duties and meets set objectives within a work environment.

Mandatory Arbitration Agreement

A contract clause requiring parties to resolve disputes through arbitration rather than in court, usually as a condition of employment.