Posted by dell on Friday, March 19, 2010 at 12:56am.
CI95 = mean + or - 1.96(sd divided by √n)
...where + or - 1.96 represents the 95% confidence interval using a z-table, sd = standard deviation, √ = square root, and n = sample size.
Using your data:
CI95 = 130 + or - 1.96 (12/√36)
I'll let you finish the calculation to determine the interval.
I hope this will help.
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