b) The Energy Information Administration gathers data on residential energy consumption and expenditures and publishes its findings in Residential Energy Consumption Survey: Consumption and Expenditures. The independent simple random samples of households in the four U.S. regions yielded the data on last year’s energy consumptions are shown in Table 2. At the 5% significance level, do the data provide sufficient evidence to conclude that a difference exists in last year’s mean energy consumption by households among the four U.S. regions? Table 2: Last year’s energy consumptions for samples of households in the four U.S. regions Northeast Midwest South West 15 17 11 10 10 12 7 12 13 18 9 8 14 13 13 7 13 15 - 9 - 12 - -
b) The Energy Information Administration gathers data on residential energy consumption and expenditures and publishes its findings in Residential Energy Consumption Survey: Consumption and Expenditures. The independent simple random samples of households in the four U.S. regions yielded the data on last year’s energy consumptions are shown in Table 2. At the 5% significance level, do the data provide sufficient evidence to conclude that a difference exists in last year’s
Table 2: Last year’s energy consumptions for samples of households in the four U.S. regions
Northeast Midwest South West
15 17 11 10
10 12 7 12
13 18 9 8
14 13 13 7
13 15 - 9
- 12 - -
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