Biology Forums - Study Force

Use the following to answer the questions below:

A small university is concerned with monitoring the electricity usage in its Student Center, and its officials want to better understand what influences the amount of electricity used on a given day. They collected data on the amount of electricity used in the Student Center each day and the daily high temperature for nearly a year. They also made note of whether each day was a weekend or not (1 = Saturday/Sunday and 0 = Monday - Friday). Regression output is provided.

Helpful notes: 1) Electricity usage is measured in kilowatt hours, 2) During the cold months, the Student Center is heated by gas, not electricity, and 3) Air conditioning the building during the warm months does use electricity.

The regression equation is Electricity = 83.6 + 0.529 High Temp - 25.2 Weekend

Predictor	Coef	SE Coef	T	P
Constant	83.560	4.238	19.72	0.000
High Temp	0.52918	0.07020	7.54	0.000
Weekend	-25.168	3.724	-6.76	0.000

S = 29.8162   R-Sq = 24.7%   R-Sq(adj) = 24.2%

Analysis of Variance

Source	DF	SS	MS	F	P
Regression	2	90481	45241	50.89	0.000
Residual Error	310	275592	889	​	​
Total	312	366073	​	​	​

Predict the amount of electricity used on a Saturday with a high temperature of 68°F. Use one decimal place in your answer.

▸ 119.6 kilowatt hours

▸ 94.4 kilowatt hours

▸ 58.9 kilowatt hours

▸ 92.4 kilowatt hours

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