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An environmental agency claims that a specific car model emits an average of 120 g of CO2 per km. A researcher suspects the actual emission is lower due to new fuel regulations. A sample of 10 cars yields a mean of \(\bar{x} = 118\) g/km with a standard deviation of \(s = 3\) g/km.
Perform a hypothesis test at the \(5\pourcent\) level.
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