0 Frequency 2 4 A building contractor collected information on energy usage. A sample of 30 houses, each of which had recently had insulation installed in the walls and the ceilings, was selected. Download and open the insulation.xlsx file in Excel. This file contains the energy usage (in Watts, W) for each of these 30 houses in the week before the insulation was installed, and again the week after the insulation was installed. Use Excel to carry out a suitable test to address the following research question. Does average weekly household energy usage change following the installation of insulation? Use the results of your test, and the histograms provided below, to answer this question. A: Energy Before B: Energy After b 8 00 180 200 220 240 260 280 300 320 Energy usage (W) before 0 Frequency 1 2 3 4 5 6 T 100 150 200 Energy usage (W) after 25-0