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(d) An ECE battery company claims that energy consumption and range of a battery electric vehicle, on average, covering 20,000 kilometers driven electrically based on the daily usage log in a particular year. A researcher tests on 16 vehicles in real life conditions and finds that they last on average of 19,500 kilometers with a standard deviation of 1,200 kilometers. Carry out the hypothesis to test, on average, the electric batteries last less 20,000 kilometers at 5% level of significance. (6 marks)