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A random sample of 36 Hollywood movies made in the last 11 years had a mean length of 126.2 minutes, with a standard deviation of

A random sample of 36 Hollywood movies made in the last 11 years had a mean length of 126.2 minutes, with a standard deviation of 21.4 minutes. Construct a 90% confidence interval for the true mean length of all Hollywood movies made in the last 11 years. Show all steps.

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