Since 2007, a psychological association has supported an annual nationwide survey to examine stress across the United States. One year, a total of 770 people (18- to 33-year-olds) were asked to...

Since 2007, a psychological association has supported an annual nationwide survey to examine stress across the United States. One year, a total of 770 people (18- to 33-year-olds) were asked to indicate their average stress level (on a 10-point scale) during a month. The mean score was 5.5. Assume that the population standard deviation is 2.6.

Give the margin of error for a 95% confidence interval. (Enter your answer to three decimal places.)