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A sample of size n : 39 has sample mean A : 57 and sample standard deviation 3 : 9.9. Part: 0 / 2 Part 1 of 2 (a) Construct a 95% confidence interval for the population mean [4. Enter the values for the lower and upper limits and the mean to graph. Round the answers to one decimal place. 95% confidence interval Let's go to the movies: A random sample of 42 Hollywood movies made in the last 10 years had a mean length of 111.7 minutes, with a standard deviation of 13.8 minutes. Par'tlon o (a) Construct a 90% confidence interval for the true mean length of all Hollywood movies in the last 10 years. Round the answers to at least one decimal place. A 90% condence interval for the true mean length of all Hollywood movies made in the last 10 years is ' 108.2 '