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A random sample of six cars from a certain model year had the following gas usage in miles per gallon. Find the 80% confidence interval

A random sample of six cars from a certain model year had the following gas usage in miles per gallon. Find the 80% confidence interval for the true mean gas consumption for cars if this model year. Find the Left and Right endpoints.

Sample Data: 18, 20, 21, 18.8, 20.7, 18.3

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