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QUESTION
A random sample of 13 DVD movies had a mean length of 119.4 minutes, with a standard deviation of 73.8 minutes.
A random sample of 13 DVD movies had a mean length of 119.4 minutes, with a standard deviation of 73.8 minutes. Find the lower bound of the 90% confidence interval for the true mean length of all Hollywood movies. Assume movie lengths to be approximately normally distributed.
