Assume the population of kilowatt-hours tobe normal

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The Edison ElectricInstitute has published figures on the annual number ofkilowatt-hours expended by various home appliances. It is claimed that a vacuum cleaner expends anaverage of 46 kilowatt-hours per year. If a random sampleof 12 homes included in a planned study indicatesthat vacuum cleaners expend an average of 42kilowatt-hours per year with a standard deviation of 11.9kilowatt-hours, does this suggest at the 0.05 level ofsignificance that vacuum cleaners expend, on the average, less than46 kilowatt-hours annually? Assume the population of kilowatt-hours tobe normal.

Reference no: EM13337854

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