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A statistical program is recommended. 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 at 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. 19,281 31,209 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. 124,299 123,676 156,043 4-8 p.m. 113,555 111,727 128,899 8-12 midnight 41,300 48,122 73,933 (a) Is there a seasonal effect over the 24-hour period? O No, the time series plot indicates a curvilinear trend with no seasonal effect. O No, the time series plot indicates a horizontal pattern. No, the time series plot indicates a linear trend with no seasonal effect. Yes, the time series plot indicates a seasonal effect with a possible linear trend. (b) Compute seasonal indexes for the six 4-hour periods. (Round your answers to four decimal places.) Time Period Seasonal Index Adjusted Seasonal Index 12-4 a.m. 4-8 a.m. 8-12 noon 12-4 p.m. 4-8 p.m. 8-12 midnight (c) Use trend adjusted for seasonal indexes to estimate the company's normal usage (in kWh) over the period of interrupted service. (Round your answer to the nearest integer.) kWh