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A filmologist is currently writing a report about feature films in the late 2010s As a part of her research the filmologist would like to estimate the mean length of feature films in the late 2010s A random sample of 266 feature films from the 2010s was selected and the average of the sample was found to be 104 minutes Suppose the standard deviation of the lengths of all feature films in the late 2010s is known to be 8 5 minutes Find three different confidence intervals one with a 99 confidence level one with a 95 confidence level and one with a 90 confidence level for the average length of all feature films in the late 2010s Notice how the confidence level affects the margin of error and the width of the interval Report confidence interval solutions using interval notation Round solutions to three decimal places if necessary The margin of error for a 99 confidence interval is given by E A 99 confidence interval is given by The margin of error for a 95 confidence interval is given by E A 95 confidence interval is given by The margin of error for a 90 confidence interval is given by E A 90 confidence interval is given by If the level of confidence is decreased leaving all other characteristics constant the margin of error of the confidence interval will Select an answer If the level of confidence is decreased leaving all other characteristics constant the width of the confidence interval will Select an answer

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