Electric power consumption is measured in kilowatt-hours (kWh). The local utility company offers an interrupt program whereby commercial customers that participate receive favorable rates but must agree to cut back consumption if the utility requests them to do so. A certain company cuts back consumption a 12:00 noon Thursday. To assess the savings, the utility must estimate the company's usage without the interrupt. The period of interrupted service was from noon to 8:00 p.m. Data on electric power consumption for the previous 72 hours are available. Time Period Monday Tuesday Wednesday Thursday 12-4 a.m. 19,291 31,219 27,340 4-8 a.m. 33,195 37,014 32,715 8-12 noon 99,516 119,978 152,475 12-4 p.m. 124,299 123,666 156,033 4-8 p.m. 113,545 111,727 128,889 8-12 midnight 41,310 48,122 73,933 (a) Is there a seasonal effect over the 24-hour period? O No, the time series plot indicates a horizontal pattern. O Yes, the time series plot indicates a seasonal effect with a possible linear trend. O No, the time series plot indicates a curvilinear trend with no seasonal effect. O No, the time series plot indicates a linear trend with no seasonal effect.
Electric power consumption is measured in kilowatt-hours (kWh). The local utility company offers an interrupt program whereby commercial customers that participate receive favorable rates but must agree to cut back consumption if the utility requests them to do so. A certain company cuts back consumption a 12:00 noon Thursday. To assess the savings, the utility must estimate the company's usage without the interrupt. The period of interrupted service was from noon to 8:00 p.m. Data on electric power consumption for the previous 72 hours are available. Time Period Monday Tuesday Wednesday Thursday 12-4 a.m. 19,291 31,219 27,340 4-8 a.m. 33,195 37,014 32,715 8-12 noon 99,516 119,978 152,475 12-4 p.m. 124,299 123,666 156,033 4-8 p.m. 113,545 111,727 128,889 8-12 midnight 41,310 48,122 73,933 (a) Is there a seasonal effect over the 24-hour period? O No, the time series plot indicates a horizontal pattern. O Yes, the time series plot indicates a seasonal effect with a possible linear trend. O No, the time series plot indicates a curvilinear trend with no seasonal effect. O No, the time series plot indicates a linear trend with no seasonal effect.
Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter9: Systems Of Linear Equations
Section9.6: Wind And Water Current Problems
Problem 8P
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