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Determined to find out if his new air conditioner is saving him money, Orlando decides to record the daily electricity use at his house.

 

Determined to find out if his new air conditioner is saving him money, Orlando decides to record the daily electricity use at his house. He records the electricity meter's reading each morning. If Orlando makes it home by 5 o'clock, he records the meter's reading then to find out how much electricity is 73 kw/h. being used during the day. He takes 25 readings and find x = 395 kilowatt/hours with s = Construct an 80% confidence interval concerning the true mean of the electricity use.

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