SOLUTION: Nine hundred (900) high school freshmen were randomly selected for a national survey. Among survey participants, the mean grade-point average (GPA) was 2.7, and the standard deviat

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Question 671767: Nine hundred (900) high school freshmen were randomly selected for a national survey. Among survey participants, the mean grade-point average (GPA) was 2.7, and the standard deviation was 0.4. What is the margin of error, assuming a 95% confidence level?
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi,

Nine hundred (900) high school freshmen 

μ = 2.7 ,  σ  = .4

margin of error, assuming a 95% confidence level

 ME =+1.96%28.4%2Fsqrt%28900%29%29