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Let's go to the movies: A random sample of 35 Hollywood movies made in the last 10 years had a mean length of 125.2 minutes,

Let's go to the movies: A random sample of 35 Hollywood movies made in the last 10 years had a mean length of 125.2 minutes, with a standard deviation of 20.4 minutes.

a). Construct a 95% conference interval for the true mean length of all Hollywood movies made in the last 10 years.

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