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A random sample of 45 Hollywood movies made since the year 2000 has a mean length...

A random sample of 45 Hollywood movies made since the year 2000 has a mean length of 111.7 minutes. If it is known that the population standard deviation of Hollywood movie times is 13. 8 minutes, construct a 95% confidence interval for the mean length of all Hollywood movies made since the year 2000.

Math   Statistics-And-Probability   
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Let denotes the mean length of all Hollywood movies made since the year 2000.

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