Question

[6.17] The State of Stress in the US—Since 2007, the American Psychological Association has supported an annual nationwide survey to examine stress across the United States. This year, 720 millennials (22- to 37-year olds) were asked to rate their average stress levels during the past month. The mean score was 5.5 on a 10-point scale. Assume the population standard deviation is known to be 2.8

A.) Use the information provided to estimate the stress levels of all millennials at 95% confidence

i. List the conditions required to calculate this estimate and comment on how they were met:

ii. Mechanics: Formula, relevant substitutions, and calculations:

iii. Interpret the results:

B.) Explain to someone who knows very little about statistics what is meant by a 95% confidence level.

Answer 1