Question: The XYZ Power Company wonders if higher oil prices could cause higher electrical usage for home heating. To measure changes over the past year, a simple random sample of 40 households was selected for January 2000 and compared with a sample of 50 households for January 2001 .

The sample results are:

Sample 1 (January 2000), \(\overline{\mathrm{X}}_{1}=1,645 \mathrm{kwh}, \mathrm{s} 1=298 \mathrm{kwh}, \mathrm{n}_{1}=40\)

Sample 2 (January 2001), \(\overline{\mathrm{X}}_{2}=1,803 \mathrm{kwh}, \mathrm{s} 2=305 \mathrm{kwh}, \mathrm{n}_{2}=50\)

Test at the \(10 \%\) level of significance if the average residential electricity usage per household has changed for the month of January.

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Solution: The downloadable solution consists of 3 pages
Deliverable: Word Document