Construct a 90 confidence interval for the average gasoline


In 12 test runs an experimental engine consumed on the average 12.9 gallons of gasoline per minute with a standard deviation of 1.6 gallons.

a) Construct a 90% confidence interval for the average gasoline consumption of the engine.

b) Construct a 95% confidence interval for the standard deviation.

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Basic Statistics: Construct a 90 confidence interval for the average gasoline
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