Question
Most new car models sold in the European Union have to undergo official tests for fuel consumption. Consider a new car model: the official fuel
Most new car models sold in the European Union have to undergo official tests for fuel consumption. Consider a new car model: the official fuel consumption figure for the urban cycle is published as 11.8 litres of fuel per 100 km. A consumer rights organization is interested in examining whether this published figure is truly indicative of urban driving.
(i) State the hypotheses that would enable the consumer rights organization to investigate whether the model's fuel consumption is more than the published 11.8 litres per 100 km.
(ii) A sample of 50 fuel consumption tests with the new model showed a sample mean of 12.10 litres per 100 km and a sample standard deviation of 0.92 litre per 100 km. What conclusion should be drawn from the sample results? Use = 0.01.
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