Researchers want to know if a new fuel treatment leads to a change in the mean fuel usage of a certain car. To test this, they conduct an experiment in which they measure the fuel usage (litres per km) of 11 cars with and without the fuel treatment. Which hypothesis test is appropriate? a) chi-squared test b) one sample t-test c) two sample t-test d) t-test of differences e) one sample t-test of slope

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