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January 30, 2015

January 30, 2015

Posted by **Anige** on Sunday, June 5, 2011 at 1:25pm.

- statistics -
**MathGuru**, Monday, June 6, 2011 at 8:13pmFormula:

CI95 = mean + or - (1.96)(sd)/√n

Mean = (23100 + 24900)/2 = 24000

Standard deviation = 5808.26

CI95 = 24000 + or - 900 --> gives you confidence interval of 23100 to 24900.

Therefore:

900 = (1.96)(sd)/√n

900 = (1.96)(5808.26)/√n

Solve for n. Round n to whole number.

I hope this will help.

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