SOLUTION: Find the margin of error. 95% confidence interval; n = 91 ; = 55, s = 5.4 How do I solve this with a calculator?

Algebra ->  Probability-and-statistics -> SOLUTION: Find the margin of error. 95% confidence interval; n = 91 ; = 55, s = 5.4 How do I solve this with a calculator?      Log On


   

Question 1053512: Find the margin of error.
95% confidence interval; n = 91 ; = 55, s = 5.4
How do I solve this with a calculator?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
Need to know re Margin of Error:
ME =± +z%2Asigma%2Fsqrt%28n%29
0r
ME =± z%2Asqrt%28%28p%281-p%29%29%2Fn%29
|In this ex, with info given
95% confidence interval
ME =± +z%2Asigma%2Fsqrt%28n%29
z = invNorm( 95 +.05/2) 0r z =invNorm(.05/2)
z = ± 1.96
ME = ± +1.96%2A5.4%2Fsqrt%2891%29 ***
95% confidence interval
55 ± ME