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b) Fuel consumption tests are conducted for a particular model of car. If a 95% confidence interval with a margin of error of 0.6 kilometer

b) Fuel consumption tests are conducted for a particular model of car. If a 95% confidence interval with a margin of error of 0.6 kilometer per liter is desired, how many cars should be used in the test? Assume that a preliminary test indicate the standard deviation is 1.4 kilometers per litre.

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