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:

Positive Transfer

The beneficial effect of prior learning on the acquisition of new skills or knowledge, where skills from one context enhance performance in another.

Conscious Attention

The focused and deliberate awareness and processing of the present moment or a specific stimulus.

Déjà Vu

The feeling of having already experienced the present situation, a phenomenon that's often mysterious and hard to explain.

Anterograde Amnesia

A condition that prevents an individual from forming new memories after the onset of the condition, though memories from before the event may remain intact.