Cellulon, a manufacturer of home insulation, wants to develop guidelines for builders and consumers on how the thickness of the insulation in the attic of a home and the outdoor temperature affect natural gas consumption. In the laboratory, it varied the insulation thickness and temperature. A few of the findings are: Monthly Natural Gas Consumption (cubic feet), Thickness of Insulation Outdoor Rectangular Snip Temperature (F), (inches), x1 X2 y 30.3 6.0 40.0 26.9 12 40 22.1 8 49 On the basis of the sample results, the regression equation is: y = 62.65 1.86x1 - 0.52x2 a. How much natural gas can homeowners expect to use per month if they install 6 inches of insulation and the outdoor temperature is 40 degrees F? (Round your answer to 2 decimal places.) cubic Natural gas feet b. What effect would installing 7 inches of insulation instead of 6 have on the monthly natural gas consumption (assuming the outdoor temperature remains at 40 degrees F)? (Round your answers to 2 decimal places.) b. What effect would installing 7 inches of insulation instead of 6 have on the monthly natural gas consumption (assuming the outdoor temperature remains at 40 degrees F)? (Round your answers to 2 decimal places.) of cubic feet of monthly natural gas consumption, down to cubic feet. c. The regression coefficients b1 and b2 are negative? Is this logical? The negative signs of the regression coefficients b1 and b2 are
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
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Units and Measurements
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Cellulon, a manufacturer of home insulation, wants to develop guidelines for builders and consumers on how the thickness of the insulation in the attic of a home and the outdoor temperature affect natural gas consumption. In the laboratory, it varied the insulation thickness and temperature. A few of the findings are:
| Monthly Natural Gas Consumption (cubic feet), | Thickness of Insulation (inches), | Outdoor Temperature (ºF), | |||
| y | x1 | x2 | |||
| 30.3 | 6.0 | 32.0 | |||
| 25.2 | 12 | 40 | |||
| 30.5 | 8 | 49 | |||
On the basis of the sample results, the regression equation is:
yˆ y^ = 57.25 − 1.07x1 − 0.64x2
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